Question

efetue as multiplicaçoes e , de pois , some os termos semelhantes .
a) 2x(x-2)+3x(x-5)=
b)x(2x-10)-5x(x-2)=
c)(x+2)(x6+3)-2(x+4)=

Answer 1

a)
  2x(x-2)+3x(x-5)=
=2x²-4x+3x²-15x
=5x²-19x

b)
  x(2x-10)-5x(x-2)=
=2x²-10x-5x²+10x
=-3x²

c)
  (x+2)( x+3) -2(x+4)=
= x²+3x+2x+6-2x-8
=x²+3x-2