using identities find the following (5a+3)2
LilyWhite:
( 5a + 3 )2 ===> (a+b)2 = a2 + b2 + 2ab
(5a)2 + (3)2 + 2 × 5a × 3
25a2 + 9 + 10a × 3
25a2 + 9 + 30a
25a2 + 9 + 30a = 0
25a2 + 30a = -9
a2 + 30a = -9 / 25
a2 + 30a = -0.36
upto 25a2 + 9 + 30a it is enough
if u want exact "a" answer then elaborate
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(a+b)^2=a^2+b^2+2ab
= 25a^2+9+30a
= 25a^2+9+30a
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