Question

2(x + 4)2 = 20 solve by square roots

Answer 1

x = − 4 ± √ 10,

Explanation:

2(x + 4)² = 20

=> 2(x + 4) (x + 4) = 20

=> 2x + 8 (x + 4) = 20

=> 2x² + 8x + 8x + 32 = 20

=> 2x² + 16x + 32 = 20

=> 2x² + 16x + 12 = 0

=> Now solve using the quadratic formula:

x = − 4 ± √ 10,

Radical form: − 4 ± √ 10,

Decimal form: -0.84, -7.16

Hope this helps!