Evaluate
\left(y-4\right)\left(y+6\right)
Expand
y^{2}+2y-24
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y^{2}+2y+1-25
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+1\right)^{2}.
y^{2}+2y-24
Subtract 25 from 1 to get -24.
y^{2}+2y+1-25
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+1\right)^{2}.
y^{2}+2y-24
Subtract 25 from 1 to get -24.
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