Question

como eu faço ????????​

Answer 1

Resposta:

1.a)(x+9)²=(x+9).(x+9)=x²+81

b)(10-y²)=(10-y).(10-y)=100-y²

c)(6x+1)²=(6x+1).(6x+1)=36x²

+1

d)(7x-3)²=(7x-3).(7x-3)=49x²-9

2.a)64-x²=x²=64

b)9x²-25=81-25=x²=21

c)121-4x²y3=117x²-y³

d)729²-324²=531.441-104.976=426.465