Question

Calcule os valores de x na função g(x)= 2x²+ 2x-12 quando:a)g(x)=-8b)g(x)= -12c)g(x)= 0

Answer 1

g(x)=2x²+2x-12

g(x)=-8
-8=2x²+2x-12
2x²+2x-4=0
x²+x-2=0
(x+2)(x-1)=0

x=-2

x=1

g(x)=-12
-12=2x²+2x-12
2x²+2x=0
x²+x=0
x(x+1)=0

x=0

x=-1

g(x)=0
2x²+2x-12=0
x²+x-6=0
(x+3)(x-2)=0

x=-3

x=2