Evaluate
-3\left(y-4\right)\left(y+12\right)
Expand
144-24y-3y^{2}
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y^{2}-24y+144-4y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-12\right)^{2}.
-3y^{2}-24y+144
Combine y^{2} and -4y^{2} to get -3y^{2}.
y^{2}-24y+144-4y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-12\right)^{2}.
-3y^{2}-24y+144
Combine y^{2} and -4y^{2} to get -3y^{2}.
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