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You take the expression and, wherever there is the variable n in the expression, you substitute 12. Wherever there is m, you substitute 4. Then you evelaute the expression.

For example n2 - 2mn + 27m = 122 - 2*4*12 + 27*4 = 144 - 96 + 108 = 156

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10y ago
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Q: How do you evaluate each expression for n equals 12 and m equals 4?
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