Question

por favor alguem responde? dou 5 pontos C) (x-15)-(x-4) d) (x-2) (x-5) e) (x+y)^2-x^2-y^2

Answer 1

$(x-15)-(x-4) = x-15-x+4=-11\\\\ (x-2) (x-5) = x^2-5x-2x+10=x^2-7x+10\\\\\ (x+y)^2-x^2-y^2=x^2+2xy+y^2-x^2-y^2=2xy$