Evaluate
\left(3x+2\right)\left(3x+14\right)
Expand
9x^{2}+48x+28
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9x^{2}+48x+64-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+8\right)^{2}.
9x^{2}+48x+28
Subtract 36 from 64 to get 28.
9x^{2}+48x+64-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+8\right)^{2}.
9x^{2}+48x+28
Subtract 36 from 64 to get 28.
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