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OpenStudy (okayniyah):
please help..... (a + b - c)(a + b + c)
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OpenStudy (okayniyah):
@welshfella
OpenStudy (okayniyah):
@mjdennis
OpenStudy (scott208):
2a+2b (there is no c because 1c-1c=0)
OpenStudy (whitakerjasmine09):
with what?
OpenStudy (mjdennis):
I put them on top of each other, just like longhand integer multiplication: (a + b - c) x (a + b + c) ----------- Multiply +c times each a+b-c, then +b, then +a ...
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