Question

dada a função f(x)3x²+5x-2 substituído x por -2

Answer 1

f(x)=3x²+5x-2
f(-2)=3.(-2)²+5.(-2)-2
f(-2)=3.(4)-10-2
f(-2)=12-12
f(-2)=0

Answer 2

$f(x)=3x^2+5x-2~~~~para~~~~x=-2\\\\\\ f(-2)=3(-2)^2+5(-2)-2\to\\\\ f(-2)=3.4-10-2\to\\\\ f(-2)=12-12\to\\\\ f(-2)=0$