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OpenStudy (anonymous):
From 4a + 7b - 12c subtract 8a - 9b + 12d.
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OpenStudy (anonymous):
i got 4a^2-2b?
OpenStudy (aroub):
do u mean 4a+7b-12 - 8a-9b+12d
OpenStudy (anonymous):
ya
OpenStudy (aroub):
4a-2b+12d-12c
OpenStudy (anonymous):
-4a + 16b -12d -12
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OpenStudy (anonymous):
oops
OpenStudy (aroub):
u have to subtract
OpenStudy (anonymous):
yeah so 4a - 8a is -4a
OpenStudy (anonymous):
and +7b - (-9b) which makes a + 9b... = +16b
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