Question

Please help don't give silly answers​

Answer 1

Answer:

1) 7²×2²×(-5)²

using the identity

a^m×b^m=(ab)^m

7²×2²×-5²=(7×2-5)²=4900

2) (-2/3)³×(-2/3)⁶

using the identity

a^m×a^n=a^m+n

(-2/3)^3+6=(-2/3)^9

3) x³+2x²+3x+1

x=1

1³+2×1²+3×1+1

1+2+3+1=7

4)5-(x+y)

5) -3³/5³

hope it helps