Answer
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Work Step by Step
1.$$(a+b)^2=a^2+2ab+b^2$$
2.$$(a-b)^2=a^2-2ab+b^2$$
3.$$(a-b)^3=a^3-3a^2b+3ab^2-b^3$$
4.$$(a+b)^3=a^3+3a^2b+3ab^2+b^3$$
5.$$(a+b)(a-b)=a^2-b^2$$
Using 1 and 5 respectively,
$(x+5)^2=x^2+10x+25$
and $(x+5)(x-5)=x^2-25$
