Evaluate
-\left(7s-3\right)\left(s+3\right)
Expand
9-18s-7s^{2}
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9s^{2}-18s+9-16s^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3s-3\right)^{2}.
-7s^{2}-18s+9
Combine 9s^{2} and -16s^{2} to get -7s^{2}.
9s^{2}-18s+9-16s^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3s-3\right)^{2}.
-7s^{2}-18s+9
Combine 9s^{2} and -16s^{2} to get -7s^{2}.
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