Evaluate
\left(4x-7\right)\left(4x+1\right)
Expand
16x^{2}-24x-7
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16x^{2}-24x+9-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-3\right)^{2}.
16x^{2}-24x-7
Subtract 16 from 9 to get -7.
16x^{2}-24x+9-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-3\right)^{2}.
16x^{2}-24x-7
Subtract 16 from 9 to get -7.
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