Question

Sa se calculeze :
(2x-y)totul la a 2
(4+2x)la a2

Answer 1

$(2x-y)^2=(2x)^2-2 \cdot 2x \cdot y+y^2=4x^2-4xy+y^2 \\ (4+2x)^2=4^2+2 \cdot 4 \cdot 2x+(2x)^2=16+16x+4x^2$