SOLUTION: Express 9x^2 - 15x in the form (3x - a)^2 - b.

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Question 1199993: Express 9x^2 - 15x in the form (3x - a)^2 - b.
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
(3x-a)^2 = 9x^2 - 6ax -> 6a = 15 -> a = 5/2
(3x - 5/2)^2 = 9x^2 - 15x + 25/4.
The constant term in the original equation is zero so we must subtract 25/4.
Ans: (3x - 5/2)^2 - 25/4