Question

Solve the following quadratic equation 2x4+4x-8=0

Answer 1

Step-by-step explanation:

2x2 + 4x - 8 = 0

⇒ 2x2 + 4x = 8

⇒ x2 + 2x = 4

⇒ x2 + 2x + 1 = 4 + 1

⇒ (x + 1)2 = 5

⇒ (x + 1) = ± √5

⇒ x = ± √5 - 1

⇒ x = +√5 - 1 , or x = -√5 - 1

x = -1 ± √5 .