Evaluate
8st+\left(s-5t\right)^{2}
Expand
s^{2}-2st+25t^{2}
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s^{2}-10st+25t^{2}+8st
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(s-5t\right)^{2}.
s^{2}-2st+25t^{2}
Combine -10st and 8st to get -2st.
s^{2}-10st+25t^{2}+8st
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(s-5t\right)^{2}.
s^{2}-2st+25t^{2}
Combine -10st and 8st to get -2st.
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