Question

dada a funçao f(x)=2x^{3} - 4x + 2 calcule f(1) - f(3)

Answer 1

$f(x) = 2x^{3} -4x+2\\\\f(1) = 2*1^{3} -4*1+2\\f(1) =2*1-4+2\\f(1) =2-4+2\\f(1)=0\\\\f(3)=2*3^{3} -4*3+2\\f(3)=2*27-12+2\\f(3)=54-12+2\\f(3)=42+2\\f(3)=44\\\\f(1)-f(3)=0-44\\\\f(1)-f(3)=-44$