Question

1-Simplifique as expressões :

a-( 2x +1)2 + ( x - 5)2 =

b-( x -1 )2 - ( x -1)2 =

c-( x - 3 )2 - (x + 2 )2 + (x + 3) . (x - 1 ) =

Answer 1

A- (2x.2+2.1)+(2x-10) =
4x+2+2x-10 = 6x-8

B- (x.2-2.1)-(x.2-2.1) =
(2x-2)-(2x-2) =2x-2-2x+2 = 0

C- (x.2-3.2)-(x.2+2.2)+
(x.x-x.1+3.x-1.3) =
(2x-6)-(2x+4)+(x²-x+3x-3) =
x²+3x+2x-2x-x-6-4-3=
x²+2x-13