Question

y=20x-x², qual a imagem do numero real 10

Answer 1

$\large\boxed{\begin{array}{l}\sf y=20x-x^2\\\sf f(x)= 20x-x^2\\\sf f(10)=20\cdot10-10^2\\\sf f(10)=200-100\\\sf f(10)=100\end{array}}$