Please help me with these Polynomial Identities and Proofs problems for my notes if you can

1. Use polynomial identities to prove that 63^2 = (60 + 3)^2

2. Use polynomial identities to prove that 99 = 100 - 1

Please show and explain all your steps. Thank you for your help.

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Domking · 61-69, M

Similarly polynomial identity 3
(x+y)*(x-y)=x^2-y^2
If x=10 & y=1
(10+1)×(10-1)=10^2-1^2
11×9=100-1
99=99