Question

Solve the quadratic equation by completing the square . x ^ 2 + 4x - 3 = 0

A) x=4 pm sqrt 7

B) x=2 pm sqrt 7

C)x=-4 pm sqrt 7

D) x=-2 pm sqrt 7

Answer 1

D

Explanation:

x²+4x=3

add 4 both sides

x²+4x+4=7

(x+2)²=7

x=-2±√7