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