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OpenStudy (anonymous):
r^2-4r-21 factor
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OpenStudy (anonymous):
What two numbers add to make -4 and multiply to make -21 ?
OpenStudy (anonymous):
r^2-(7-3)r-21 Now proceed.............
OpenStudy (anonymous):
ok... so r-7 and r+3 ?????????????
OpenStudy (anonymous):
Yeap
OpenStudy (anonymous):
really!?
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