Find the Equation Given the Roots -2i and square root of 10

$- 2 i$ and $\sqrt{10}$

Step 1

Roots are the points where the graph intercepts with the x-axis $(y = 0)$ .

$y = 0$ at the roots

Step 2

The root at $x = - 2 i$ was found by solving for $x$ when $x - (- 2 i) = y$ and $y = 0$ .

The factor is $x + 2 i$

Step 3

The root at $x = 2 i$ was found by solving for $x$ when $x - (2 i) = y$ and $y = 0$ .

The factor is $x - 2 i$

Step 4

The root at $x = \sqrt{10}$ was found by solving for $x$ when $x - (\sqrt{10}) = y$ and $y = 0$ .

The factor is $x - \sqrt{10}$

Step 5

Combine all the factors into a single equation.

$y = (x + 2 i) (x - 2 i) (x - \sqrt{10})$

Step 6

Multiply all the factors to simplify the equation $y = (x + 2 i) (x - 2 i) (x - \sqrt{10})$ .

Expand $(x + 2 i) (x - 2 i)$ using the FOIL Method.

Apply the distributive property.

$y = (x (x - 2 i) + 2 i (x - 2 i)) (x - \sqrt{10})$

Apply the distributive property.

$y = (x \cdot x + x (- 2 i) + 2 i (x - 2 i)) (x - \sqrt{10})$

Apply the distributive property.

$y = (x \cdot x + x (- 2 i) + 2 i x + 2 i (- 2 i)) (x - \sqrt{10})$

Simplify terms.

Combine the opposite terms in $x \cdot x + x (- 2 i) + 2 i x + 2 i (- 2 i)$ .

Reorder the factors in the terms $x (- 2 i)$ and $2 i x$ .

$y = (x \cdot x - 2 i x + 2 i x + 2 i (- 2 i)) (x - \sqrt{10})$

Add $- 2 i x$ and $2 i x$ .

$y = (x \cdot x + 0 + 2 i (- 2 i)) (x - \sqrt{10})$

Add $x \cdot x$ and $0$ .

$y = (x \cdot x + 2 i (- 2 i)) (x - \sqrt{10})$

Simplify each term.

Multiply $x$ by $x$ .

$y = (x^{2} + 2 i (- 2 i)) (x - \sqrt{10})$

Multiply $2 i (- 2 i)$ .

Multiply $- 2$ by $2$ .

$y = (x^{2} - 4 i i) (x - \sqrt{10})$

Raise $i$ to the power of $1$ .

$y = (x^{2} - 4 (i i)) (x - \sqrt{10})$

Raise $i$ to the power of $1$ .

$y = (x^{2} - 4 (i i)) (x - \sqrt{10})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$y = (x^{2} - 4 i^{1 + 1}) (x - \sqrt{10})$

Add $1$ and $1$ .

$y = (x^{2} - 4 i^{2}) (x - \sqrt{10})$

Rewrite $i^{2}$ as $- 1$ .

$y = (x^{2} - 4 \cdot - 1) (x - \sqrt{10})$

Multiply $- 4$ by $- 1$ .

$y = (x^{2} + 4) (x - \sqrt{10})$

Expand $(x^{2} + 4) (x - \sqrt{10})$ using the FOIL Method.

Apply the distributive property.

$y = x^{2} (x - \sqrt{10}) + 4 (x - \sqrt{10})$

Apply the distributive property.

$y = x^{2} x + x^{2} (- \sqrt{10}) + 4 (x - \sqrt{10})$

Apply the distributive property.

$y = x^{2} x + x^{2} (- \sqrt{10}) + 4 x + 4 (- \sqrt{10})$

Simplify terms.

Simplify each term.

Multiply $x^{2}$ by $x$ by adding the exponents.

Multiply $x^{2}$ by $x$ .

Raise $x$ to the power of $1$ .

$y = x^{2} x + x^{2} (- \sqrt{10}) + 4 x + 4 (- \sqrt{10})$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$y = x^{2 + 1} + x^{2} (- \sqrt{10}) + 4 x + 4 (- \sqrt{10})$

Add $2$ and $1$ .

$y = x^{3} + x^{2} (- \sqrt{10}) + 4 x + 4 (- \sqrt{10})$

Multiply $- 1$ by $4$ .

$y = x^{3} + x^{2} (- \sqrt{10}) + 4 x - 4 \sqrt{10}$

Reorder factors in $x^{3} + x^{2} (- \sqrt{10}) + 4 x - 4 \sqrt{10}$ .

$y = x^{3} - x^{2} \sqrt{10} + 4 x - 4 \sqrt{10}$

Step 7

Find the Equation Given the Roots -2i and square root of 10

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