Solve Using the Quadratic Formula n^2-49=0

$n^{2} - 49 = 0$

Step 1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 2

Substitute the values $a = 1$ , $b = 0$ , and $c = - 49$ into the quadratic formula and solve for $n$ .

$\frac{0 \pm \sqrt{0^{2} - 4 \cdot (1 \cdot - 49)}}{2 \cdot 1}$

Step 3

Simplify.

Simplify the numerator.

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

$n = \frac{0 \pm \sqrt{0 - 4 \cdot 1 \cdot - 49}}{2 \cdot 1}$

Multiply $- 4 \cdot 1 \cdot - 49$ .

Multiply $- 4$ by $1$ .

$n = \frac{0 \pm \sqrt{0 - 4 \cdot - 49}}{2 \cdot 1}$

Multiply $- 4$ by $- 49$ .

$n = \frac{0 \pm \sqrt{0 + 196}}{2 \cdot 1}$

Add $0$ and $196$ .

$n = \frac{0 \pm \sqrt{196}}{2 \cdot 1}$

Rewrite $196$ as $14^{2}$ .

$n = \frac{0 \pm \sqrt{14^{2}}}{2 \cdot 1}$

Pull terms out from under the radical, assuming positive real numbers.

$n = \frac{0 \pm 14}{2 \cdot 1}$

Multiply $2$ by $1$ .

$n = \frac{0 \pm 14}{2}$

Simplify $\frac{0 \pm 14}{2}$ .

$n = \pm 7$

Step 4

The final answer is the combination of both solutions.

$n = 7, - 7$