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OpenStudy (anonymous):
Solve by factoring x^2-8x-9=0
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OpenStudy (anonymous):
Tiny - Try (x-9)*(x+1)
OpenStudy (anonymous):
how did you do that?
OpenStudy (anonymous):
ok. step by step. you have an x^2 to factor, so you know that you will have to split that into 2 different x's in different ( ). That's the easy step. Next, look at your last number (-9) and think about numbers that are factors of 9 (3 X 3 comes to mind first for me, although in ths case, it doesn't work). Here's why - you need the factors of -9 to add up to the number that you get when adding the middle digit by the factors. So, I figured other factors of nine were 1 and 9. A -9 and a +1 add up to -8, which is the middle digit we're looking for.
OpenStudy (anonymous):
okay thank you so much
OpenStudy (anonymous):
yw!
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OpenStudy (anonymous):
nobody is getting this right please help: \[2x ^{2}+3x=0\]
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