Question

Dada a função de duas variáveis f( x, y) = 3+√x-y, o valor de f (2,-2) é:
A) 0
B) 2
C) 3
D) 5
E) 1

Answer 1

Olá


Resposta correta, letra D) 5



Basta substituir a função no ponto (2, -2)
x = 2
y = -2


$\mathsf{f(x,y) ~=~3~+ ~ \sqrt{x~-~y} }\\\\\mathsf{f(2,-2) ~=~3~+ ~ \sqrt{2~-~(-2)} }\\\\\mathsf{f(2,-2) ~=~3~+ ~ \sqrt{2~+~2} }\\\\\mathsf{f(2,-2) ~=~3~+ ~ \sqrt{4} }\\\\\mathsf{f(2,-2) ~=~3~+ ~2~}}\\\\\boxed{\mathsf{f(2,-2) ~=~5 }}$