Can anyone help me solve this? Thank you so so much! 16x^3 -48x^2 -9x + 27=0
Last edited by mr fantastic; July 6th 2010 at 04:35 PM.
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By guessing one root... My "guess" is x=3, now you should know how to continue. Read here please: Rational Zeros of Polynomials
Assuming you know the factor theorem the numbers are big, so arrangement could help so when x=3 , it satisfies the equation, (x-3) is a factor, and other factors can be found by equating coefficients.
This cubic can be factored by grouping. Look at the first pair of terms and factor out the GCF; then do the same for the last pair. Can you take it from here? Finish factoring (look at 16x^2 - 9), and set each factor equal to 0.
THANK YOU ALL SO MUCH! This is very helpful!
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