Question

Which equation has the same solution as x2 + 16x + 9 = -3?

Answer 1

Explanation:

x² + 16x + 9 = - 3

x² + 16x + 12 = 0

D = 16² - 4(1)(12) = 208

√D = 4√13

`x_(1)` = ( - 16 - 4√13 ) ÷ 2 = - 8 - 2√13 ≈ - 15.21

`x_(2)` = ( - 16 + 4√13 ) ÷ 2 = 2√13 - 8 ≈ - 0.79