Evaluate
\left(3x+1\right)^{2}
Expand
9x^{2}+6x+1
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\left(3x+1\right)^{2}
Multiply 3x+1 and 3x+1 to get \left(3x+1\right)^{2}.
9x^{2}+6x+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+1\right)^{2}.
\left(3x+1\right)^{2}
Multiply 3x+1 and 3x+1 to get \left(3x+1\right)^{2}.
9x^{2}+6x+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+1\right)^{2}.
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