Question

(2x + y) (2x -y)=....?

Answer 1

(a+b)*(a-b)=a^2-b^2

(2x + y) * (2x -y)=(2x)^2-y^2=4x^2-y^2

sau

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

sper ca te-am ajutat

Answer 2

$(2x+y)(2x-y) =\big[(2x)+y\big]\big[(2x)-y\big] = (2x)^2-y^2 = 4x^2-y^2$