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s^{2}+4
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s^{2}+4
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s^{2}+4s+4-4s
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(s+2\right)^{2}.
s^{2}+4
Combine 4s and -4s to get 0.
s^{2}+4s+4-4s
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(s+2\right)^{2}.
s^{2}+4
Combine 4s and -4s to get 0.
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