Evaluate
\left(5y-7\right)^{2}
Expand
25y^{2}-70y+49
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\left(-7+5y\right)^{2}
Combine 6y and -y to get 5y.
49-70y+25y^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-7+5y\right)^{2}.
\left(-7+5y\right)^{2}
Combine 6y and -y to get 5y.
49-70y+25y^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-7+5y\right)^{2}.
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