Question

Select the correct answer.
Solve for x.

x2 + 4x - 21 = 0
A.
-3, -7
B.
-3, 7
C.
3, -7
D.
3, 7

Answer 1

i bet the equation is x²+4x-21=0
factorise
(x+7)(x-3)=0
x+7=0 , x-3=0
x=-7, x=3
the answer is C