Evaluate
7x\left(7x-24\right)
Expand
49x^{2}-168x
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49x^{2}-168x+144-144
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7x-12\right)^{2}.
49x^{2}-168x
Subtract 144 from 144 to get 0.
49x^{2}-168x+144-144
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7x-12\right)^{2}.
49x^{2}-168x
Subtract 144 from 144 to get 0.
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