Thursday, April 3, 2014

Express 9x^2-42x+49 in the form (ax+b)^2 where a and b are constants.

9x%5E2-42x%2B49=%0D%0A%283x%29%5E2-2%2A3%2A7%2Ax%2B7%5E2=%0D%0A%283x-7%29%5E2
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