Evaluate
\left(x-42\right)\left(x+3\right)
Expand
x^{2}-39x-126
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x^{2}+3x-42\left(x+3\right)
Use the distributive property to multiply x by x+3.
x^{2}+3x-42x-126
Use the distributive property to multiply -42 by x+3.
x^{2}-39x-126
Combine 3x and -42x to get -39x.
x^{2}+3x-42\left(x+3\right)
Use the distributive property to multiply x by x+3.
x^{2}+3x-42x-126
Use the distributive property to multiply -42 by x+3.
x^{2}-39x-126
Combine 3x and -42x to get -39x.
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