Evaluate
4\left(\sigma +2\right)^{2}
Expand
4\sigma ^{2}+16\sigma +16
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4\sigma ^{2}+16\sigma +16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2\sigma +4\right)^{2}.
4\sigma ^{2}+16\sigma +16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2\sigma +4\right)^{2}.
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