Thursday, May 9, 2013

use the method of completing the square to solve for x 3x^2-2x-1=0


%0D%0A3x%5E2-2x-1=0%0D%0A

%0D%0A3%28x%5E2-%282%2F3%29x%29-1=0%0D%0A



%0D%0A3%28x%5E2-%282%2F3%29x%2B1%2F9%29=1%2B3%281%2F9%29%0D%0A

%0D%0A3%28x-1%2F3%29%5E2=4%2F3%0D%0A

%0D%0A%28x-1%2F3%29%5E2=4%2F9%0D%0A





%0D%0Ax=1%2F3+%2B-++%282%2F3%29%0D%0A




so x=-1/3 or 1

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