Question

A (2x+y)^2

B (x-3)^2

C (x-2y)^2

D (y-5)^2

Answer 1

A (2x+y)^2=

(2x+y).(2x+y)=(2x)²+2.(2x).(y)+(y)²

(2x+y).(2x+y)=4x²+4xy+y²

B (x-3)^2=(x-3).(x-3)

(x-3)²=(x)²+2.(-3).(x)+(-3)²

(x-3)²=x2-6x+9

C (x-2y)^2=(x-2y).(x-2y)

(x-2y)²=(x)²+2.(x).(-2y).(-2y)²

(x-2y)²=x²-4xy+4y²

D (y-5)^2=(y-5).(y-5)

(y-5)²=(y)²+2.(-5).(y)+(-5)²

(y-5)²=y²-10y+25

espero ter ajudado!

boa tarde!