Question

f(x)=30x³-2/3x²+x-1, sendo f(3)

Answer 1

$f(x)=30x^3-\frac{2x^2}{3}+x-1\\ \\ f(3)=30.3^3-\frac{2.3^2}{3}+3-1\\ \\ f(3)=810-6+3-1\\ \\ f(3)=806$

Answer 2

$f(x) = 30x^3-\frac{2}{3}x^2+x-1 \\\\f(3) = 30\cdot3^3-\frac{2}{3}\cdot3^2+3-1 \\\\f(3) = 30\cdot27-\frac{2}{3}\cdot9+3-1 \\\\f(3) = 810-\frac{18}{3}+3-1 \\\\f(3) = 810-6+3-1 \\\\f(3)=806$