Question

(4 . x + 1/2 y)^2 é igual a?

(A) 16x^2+4xy+0,5y^2

(B) 4x^2+8xy+0,5y^2

(C) 16x^2+4xy+0,25y^2

(D) 16x^2+0,25y^2

(E) 4x^2+0,5y^2

Answer 1

(4x + 1/2y)^2

(4x)^2 + 2 (4x) (1/2y) + (1/2y)^2

16x^2 + 8x (1/2y) + 1/4y^2

16x^2 + 8/2xy + 1/4y^2

16x^2 + 4xy + 1/4y^2

OU

16x^3 + 4xy + 0,25y^2

Respista e a letra C)