Question

Complete as questões:
a) (x+10).(x-10)=x²-100
b) (9-a).(9+a)=81-a²
c) (y+8).(y-8)=y2-64
d) (m+7).(m-7)=m²-49

Answer 1

a) x²-10x+10x-100=x²-100
x²-x²-10x+10x=100-100
0-0=0
0=0
0/0 = 0
b)81-9a-9a-a²=81-a²
-a²+a²-9a-9a=81-81
0-18a=o
-18a=
a= -18/1= -18

c) y²-8y+8y-64=y²-64
y²-y²-8y+8y=64-64
0-0=0
0=0
0
d)m²-7m+7m-49=m²-49
m²-m²-7m+7m= 49-49
0-0=0
0=0
0