use the identity (a + 3b) (a + 5b)
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... For the above expression, keeping a=5a and b=3b, we get.
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Using Identity: (x + a)(x + b) = x² + (a + b)x + ab
(a+3b)(a+5b) = a² + (3b+5b)a +3b*5b
= a² + 8ab + 15b²
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