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angelinailiff8531
29.07.2019 •
Mathematics
How do you simplify x^2-4x-21 divided by x+3
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Ответ:
Notice how
3 plus -7 = -4
3 times -7 = -21
which helps us factor the trinomial
After you've factored it, we can cancel out a pair of (x+3) terms leaving us with the final answer of x-7
Note: the cancellation happens because (x+3)/(x+3) = 1. Divide anything (except 0) over itself and you'll get 1. A simpler example of this is 5/5 = 1.
Ответ:
GH
Step-by-step explanation: