rosenbergnoah rosenbergnoah

11-12-2017
Mathematics

contestada

Which of the following is a solution of x^2 + 4x = −8?
x = −2 − 2i
x = 2 + 2i
x = −4 + 4i
x = 4 − 4i

Respuesta :

tynollette tynollette

12-12-2017

x²+4x+8=0
use the quadratic formula: (sorry cannot type it here)
√(b²-4ac)=√(4²-4*1*8)=√(16-32)=√(-16)=+/- 4i
x=(-4+4i)/2 or (-4-4i)/2
x=-2+2i or x=-2-2i
the answer is A

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