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OpenStudy (anonymous):
Factoring by groups this quadratic equations -9x^2+13x-4
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OpenStudy (anonymous):
check if this right: -9x^2+13x-4 -9x^2+9x+4x-4=0 9x(-x+1) +4(x-1)=0 what am I doing wrong? Why (-x+1) and (x-1) not equal?
OpenStudy (butterflydreamer):
you're close :) take a look here: |dw:1436245778372:dw|
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