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Question

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Answer 1

3a=-5b⇒3a+5b=0
(3a+5b)²+(3a+5b)=(3a+5b)(3a+5b+1)=0*(0+1)=0

Answer 2

9a²+30ab+25b²+3a+5b=(3a+5b)²+3a+5b=(-5b+5b)²-5b+5b=0
9a²+30ab+25b²=(3a+5b)^2