February 19, 2017

Homework Help: Math; Complete the square for the expressions

Posted by asdf on Friday, December 31, 2010 at 4:08am.

I have a number of problems I'm having problem with but they start with the example given in the book

2x^2 - 10x
=2(x^2 - 5x)
=2{[x-(5/2)]^2 - [(5/2)^2]}
=2[x-(5/2)]^2 - (25/2)

Why isn't (5/2)^2 (25/4)?

I'm struggling with the exercises as well.

3x^2 - 24x
I get 3(x-4)^2 - 16 or if I try to follow the example, 3(x-4)^2 - 32, but the answer at the back of the book is 3(x-4)^2 - 48

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