using identities find the following (5a+3)2
LilyWhite:
( 5a + 3 )2 ===> (a+b)2 = a2 + b2 + 2ab
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(a+b)^2=a^2+b^2+2ab
= 25a^2+9+30a
= 25a^2+9+30a
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