Evaluate
3\left(x+1\right)\left(3x+11\right)
Expand
9x^{2}+42x+33
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9x^{2}+42x+49-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-7\right)^{2}.
9x^{2}+42x+33
Subtract 16 from 49 to get 33.
9x^{2}+42x+49-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-3x-7\right)^{2}.
9x^{2}+42x+33
Subtract 16 from 49 to get 33.
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