Question

dada a funçao f(x) = 2x²- 2x - 4,encontre os zeros da funçao?

Answer 1

Olá! 

$2 x^{2} -2x-4=0 \\ \\ a=2|b=-2|c=-4 \\ \\ D= b^{2} -4.a.c \\ D= (-2)^{2} -4.2.-4 \\ D=4+32 \\ D=36 \\ \\ x= \frac{-b+/- \sqrt{D} }{2.a} \\ \\ x= \frac{2+/- \sqrt{36} }{2.2} \\ \\ x'= \frac{2+6}{4} = \frac{8}{4}=2 \\ \\ x''= \frac{2-6}{4} = \frac{-4}{4} =-1$

BONS ESTUDOS!