Question

Solve the equation by quadratic formula. Round to the nearest Tenth, if necessary

x^2 - 49 = 0

Answer 1

`x = 7 \: or \: x = - 7.`

Explanation:

`{x}^(2) - 49 = 0`

Then

`{x}^(2) = 49`

So

`x = 7 \: or \: x = - 7.`

Answer 2

x = -7 , 7

Explanation:

a² - b² = (a + b)(a - b)

x² - 49 = 0

x² - 7² = 0

(x + 7)(x -7) = 0

x + 7 = 0 ; x - 7 = 0

x = -7 ; x = 7