Question

Dada a função definida por f (x)= 2x2 -1

Calcule
a)f(0) b)f(5) c) f (-3) d) f (-5) ?

Answer 1

$f(x) = 2x^2-1 \\ \\ a) f(0)=2.0^2-1=-1 \\ \\ \\ b) f(5)=2.5^2-1=2.25-1=50-1=49 \\ \\ \\ c) f(-3) = 2.(-3)^2-1=2.9-1=18-1=17 \\ \\ \\ d) f(-5)=2.(-5)^2-1=2.25-1=50-1=49$