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OpenStudy (anonymous):
factor -28y^2 + 7t^2
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OpenStudy (saifoo.khan):
Look for the commons.
OpenStudy (saifoo.khan):
7 is common from both of them, so: 7(-4y^2 +1)
OpenStudy (saifoo.khan):
then: 7-(2 y-1) (2 y+1)
OpenStudy (anonymous):
ok. would u have to do a t chart?
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