Question Number 10012 by konen last updated on 20/Jan/17

x−y=4 ⇒((x^2 −y^2 +4x−4y)/(2x+2y+8))=?

Answered by nume1114 last updated on 21/Jan/17

    ((x^2 −y^2 +4x−4y)/(2x+2y+8))  =(((x+y)(x−y)+4(x−y))/(2(x+y+4)))  =(((x+y+4)∙(x−y))/((x+y+4)∙2))  =((x−y)/2)=(4/2)=2