Question

função f(x) = 3x²+5x-x²-15, encontrar f(3)-f(2)

Answer 1

f(x)=2$x^{2}$+5x-15

f(3)=2×9+5×3-15 ⇒ f(3)=18+15-15 ⇒ f(3)=18
f(2)=2×4+5×2-15 ⇒f(2)=8+10-15    ⇒ f(2)=3

f(3)-f(2)=15