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OpenStudy (anonymous):
factor by grouping 4r^2+9r-28
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OpenStudy (anonymous):
write it as: 4r^2 -7r + 16r - 28 then group
OpenStudy (anonymous):
r(4r-7) +4(4r-7) =(4r-7)(r+4)
OpenStudy (anonymous):
using factoring i come up with (4r-7)(r+4)
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