Question

Considere a função f(x,y)=5x^ 3 +2x^ 2 y^ 2 -xy-3. Calcule f(2, - 1)

Answer 1

Resposta:

$\sf f(x,y)=5x^3 +2x^2 y^2 -xy-3$

Então para f(2, - 1) faça x = 2 e y = - 1:

$\sf f(2,-1)=5(2)^3 +2(2)^2(-1)^2 -(2)(-1)-3$

$\sf f(2,-1)=5(8) +2(4)(1) +2-3$

$\sf f(2,-1)=40 +8 +2-3$

$\red{\boxed{\sf f(2,-1)=47}}$