Question

Qual o valor da expressão X2-4XY+4Y2 quando X=2 e y=3

Answer 1

$\mathsf{x^2-4xy+4y^2}\\\\ \mathsf{x=2}\\ \mathsf{y=3}\\\\\\ \mathsf{2^2-4\cdot2\cdot3+4\cdot3^2}\\\\ \mathsf{4-8\cdot3+4\cdot9}\\\\ \mathsf{4-24+36}\\\\ \mathsf{-20+36}\\\\ \boxed{\mathsf{16}}$