Evaluate
\left(4x-1\right)\left(4x+3\right)
Expand
16x^{2}+8x-3
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16x^{2}+8x+1-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}+8x-3
Subtract 4 from 1 to get -3.
16x^{2}+8x+1-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}+8x-3
Subtract 4 from 1 to get -3.
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