Question

найдите значение выражения (2x-y)^2+4x(x+y) при x=2 . y=7

Answer 1

(2*2-7)^2 +4*2(2+7) = (4-7)^2+8*9 = (-3)^2 +72 = 9+72=81

Answer 2

(2x-y)^2+4x(x+y) = 4x^2-4xy+y^2+4x^2+4xy = 8x^2+y^2 = 8*4+49 = 81