Question

Which of the following is a solution of x2 + 4x = −8?

x=-2-2i
x=2+2i
x=-4+4i
x=4-4i

Answer 1

the answer for your problem is letter B
x=-2 + 2i

I hope its useful :)

Answer 2

x=-2-2i

Explanation:

There are 4 ways to solve quadratic equations. These are factorization, completing the square, formula and graphical methods.

Using the formula method, considering a quadratic equation

ax^2 + bx + c = 0,

x = (-b±√(b² - 4ac))/2a

Given x2 + 4x = −8

= x2 + 4x + 8 = 0

a = 1, b = 4 ,c = 8

x = (-4±√(4² - 4×1×8))/2×1

x = -4±√-16/2

x = -4±4i/2

x = -2±2i

x = -2-2i, x = -2+2i