Question

Помогите!!! Найдите f(5),f(-1),если,f(x)=3x²

Answer 1

$f(5) = 3 \times {5}^{2} = 3 \times 25 = 75 \\ f( - 1) = 3 \times {( - 1)}^{2} = 3 \times 1 = 3$