Question

Efetue e simplifique
a) x²-(x+10)²

b)(3x+5)² -9x²

c)(2x-1)² + x(3x-2)

d)(1+x)(1 - x) - (1+x)²

Answer 1

Boa noite!!

a) x² -(x +10)²
x² -(x² +20x +100)
x² -x² -20x -100
-20x -100
-x -5

b) (3x +5)² -9x²
9x² +30x +25 -9x²
30x +25
6x +5

c) (2x -1)² +x(3x -2)
4x² -4x +1 +3x² -2x
7x² -6x +1

d) (1+x).(x -1) -(1+x)²
x -1 +x² -x -(1 +2x +x²)
x² -1 -1 -2x -x²
-2x -2
-x -1

Bons estudos!