Answer:
2×2+x+1=0
4+x+1=0
5+x=0
x=-5
(x + 6)(x-4) = -16
x² + 2x -24 = -16
x² + 2x - 8 = 0
(x + 4)(x-2) = 0
x = - 4 or x = 2
Step-by-step explanation: