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| Math Central | Quandaries & Queries |
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Question from Monica, a student: I have to factor the following two items completely, but I am lost. I've tried factoring by substitution and grouping but they don't seem to work: 1. 5(w-3z) -10(w-3z)= 2. ab-21+a3-b7= Please help me to understand. Thank you. |
Hi Monica,
In your first problem there is a common factor of (w - 3z) which gives
5(w - 3z) - 10(w - 3z) = (5 - 10)(w - 3z) = -5(w - 3z)
I don't understand your second problem. Are you sure you have stated it correctly?
Penny
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