Find the Equation of the Parabola (0,11) , (3,2) , (-1,18)

$(0, 11)$ , $(3, 2)$ , $(- 1, 18)$

Step 1

Use the standard form of a quadratic equation $y = a x^{2} + b x + c$ as the starting point for finding the equation through the three points.

$y = a x^{2} + b x + c$

Step 2

Create a system of equations by substituting the $x$ and $y$ values of each point into the standard formula of a quadratic equation to create the three equation system.

$11 = a {(0)}^{2} + b (0) + c$

$2 = a {(3)}^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Step 3

Solve the system of equations to find the values of $a$ , $b$ , and $c$ .

Solve for $c$ in $11 = a \cdot 0^{2} + c$ .

Rewrite the equation as $a \cdot 0^{2} + c = 11$ .

$a \cdot 0^{2} + c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Simplify $a \cdot 0^{2} + c$ .

Simplify each term.

Raising $0$ to any positive power yields $0$ .

$a \cdot 0 + c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Multiply $a$ by $0$ .

$0 + c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$0 + c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Add $0$ and $c$ .

$c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$c = 11$

$2 = a \cdot 3^{2} + b (3) + c$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Replace all occurrences of $c$ with $11$ in each equation.

Replace all occurrences of $c$ in $2 = a \cdot 3^{2} + b (3) + c$ with $11$ .

$2 = a \cdot 3^{2} + b (3) + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Simplify $2 = a \cdot 3^{2} + b (3) + 11$ .

Simplify the left side.

Remove parentheses.

$2 = a \cdot 3^{2} + b (3) + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$2 = a \cdot 3^{2} + b (3) + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Simplify the right side.

Simplify each term.

Raise $3$ to the power of $2$ .

$2 = a \cdot 9 + b (3) + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Move $9$ to the left of $a$ .

$2 = 9 \cdot a + b (3) + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Move $3$ to the left of $b$ .

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + c$

Replace all occurrences of $c$ in $18 = a {(- 1)}^{2} + b (- 1) + c$ with $11$ .

$18 = a {(- 1)}^{2} + b (- 1) + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Simplify $18 = a {(- 1)}^{2} + b (- 1) + 11$ .

Simplify the left side.

Remove parentheses.

$18 = a {(- 1)}^{2} + b (- 1) + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a {(- 1)}^{2} + b (- 1) + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Simplify the right side.

Simplify each term.

Raise $- 1$ to the power of $2$ .

$18 = a \cdot 1 + b (- 1) + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Multiply $a$ by $1$ .

$18 = a + b (- 1) + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Move $- 1$ to the left of $b$ .

$18 = a - 1 b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Rewrite $- 1 b$ as $- b$ .

$18 = a - b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a - b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a - b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a - b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

$18 = a - b + 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Solve for $a$ in $18 = a - b + 11$ .

Rewrite the equation as $a - b + 11 = 18$ .

$a - b + 11 = 18$

$2 = 9 a + 3 b + 11$

$c = 11$

Move all terms not containing $a$ to the right side of the equation.

Add $b$ to both sides of the equation.

$a + 11 = 18 + b$

$2 = 9 a + 3 b + 11$

$c = 11$

Subtract $11$ from both sides of the equation.

$a = 18 + b - 11$

$2 = 9 a + 3 b + 11$

$c = 11$

Subtract $11$ from $18$ .

$a = b + 7$

$2 = 9 a + 3 b + 11$

$c = 11$

$a = b + 7$

$2 = 9 a + 3 b + 11$

$c = 11$

$a = b + 7$

$2 = 9 a + 3 b + 11$

$c = 11$

Replace all occurrences of $a$ with $b + 7$ in each equation.

Replace all occurrences of $a$ in $2 = 9 a + 3 b + 11$ with $b + 7$ .

$2 = 9 (b + 7) + 3 b + 11$

$a = b + 7$

$c = 11$

Simplify the right side.

Simplify $9 (b + 7) + 3 b + 11$ .

Simplify each term.

Apply the distributive property.

$2 = 9 b + 9 \cdot 7 + 3 b + 11$

$a = b + 7$

$c = 11$

Multiply $9$ by $7$ .

$2 = 9 b + 63 + 3 b + 11$

$a = b + 7$

$c = 11$

$2 = 9 b + 63 + 3 b + 11$

$a = b + 7$

$c = 11$

Simplify by adding terms.

Add $9 b$ and $3 b$ .

$2 = 12 b + 63 + 11$

$a = b + 7$

$c = 11$

Add $63$ and $11$ .

$2 = 12 b + 74$

$a = b + 7$

$c = 11$

$2 = 12 b + 74$

$a = b + 7$

$c = 11$

$2 = 12 b + 74$

$a = b + 7$

$c = 11$

$2 = 12 b + 74$

$a = b + 7$

$c = 11$

$2 = 12 b + 74$

$a = b + 7$

$c = 11$

Solve for $b$ in $2 = 12 b + 74$ .

Rewrite the equation as $12 b + 74 = 2$ .

$12 b + 74 = 2$

$a = b + 7$

$c = 11$

Move all terms not containing $b$ to the right side of the equation.

Subtract $74$ from both sides of the equation.

$12 b = 2 - 74$

$a = b + 7$

$c = 11$

Subtract $74$ from $2$ .

$12 b = - 72$

$a = b + 7$

$c = 11$

$12 b = - 72$

$a = b + 7$

$c = 11$

Divide each term in $12 b = - 72$ by $12$ and simplify.

Divide each term in $12 b = - 72$ by $12$ .

$\frac{12 b}{12} = \frac{- 72}{12}$

$a = b + 7$

$c = 11$

Simplify the left side.

Cancel the common factor of $12$ .

Cancel the common factor.

$\frac{12 b}{12} = \frac{- 72}{12}$

$a = b + 7$

$c = 11$

Divide $b$ by $1$ .

$b = \frac{- 72}{12}$

$a = b + 7$

$c = 11$

$b = \frac{- 72}{12}$

$a = b + 7$

$c = 11$

$b = \frac{- 72}{12}$

$a = b + 7$

$c = 11$

Simplify the right side.

Divide $- 72$ by $12$ .

$b = - 6$

$a = b + 7$

$c = 11$

$b = - 6$

$a = b + 7$

$c = 11$

$b = - 6$

$a = b + 7$

$c = 11$

$b = - 6$

$a = b + 7$

$c = 11$

Replace all occurrences of $b$ with $- 6$ in each equation.

Replace all occurrences of $b$ in $a = b + 7$ with $- 6$ .

$a = (- 6) + 7$

$b = - 6$

$c = 11$

Simplify the right side.

Add $- 6$ and $7$ .

$a = 1$

$b = - 6$

$c = 11$

$a = 1$

$b = - 6$

$c = 11$

$a = 1$

$b = - 6$

$c = 11$

List all of the solutions.

$a = 1, b = - 6, c = 11$

Step 4

Substitute the actual values of $a$ , $b$ , and $c$ into the formula for a quadratic equation to find the resulting equation.

$y = x^{2} - 6 x + 11$

Step 5

Find the Equation of the Parabola (0,11) , (3,2) , (-1,18)

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