Expand
45a^{2}+30ab+5b^{2}
Evaluate
5\left(3a+b\right)^{2}
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5\left(9a^{2}+6ab+b^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(3a+b\right)^{2}.
45a^{2}+30ab+5b^{2}
Use the distributive property to multiply 5 by 9a^{2}+6ab+b^{2}.
5\left(9a^{2}+6ab+b^{2}\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(3a+b\right)^{2}.
45a^{2}+30ab+5b^{2}
Use the distributive property to multiply 5 by 9a^{2}+6ab+b^{2}.
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