Question

Simplifique as expressões:
A)(y+5)-y(y+10)
B)(x-3)+(x+3)
C)(a-b)-(a+b).(a-b)

Answer 1

a)y+5-y²-10y= -y²-9y+5
b)x²+3x-3x-9= x²-9
c)a-b-(a²-ab+ab-b²)= a-b-a²+ab-ab+b²= -a²+a-b+b²