Hello,

Could anyone please help me with these because Im really bad in proving, I'd appreciate it.

1.prove that x^n*x^m=x^(n+m)

2.prove that (-a-b)^2=(a+b)2

3.prove that (a-b)^2=(b-a)^2

4.which is bigger or they r the same?

(7^7)7 and 7^7^7

Thanks