General--> standard form

**nikkaloo** · November 13th 2007, 09:31 PM

Okay maybe im thinking too hard but im having a terrible time completing the square of this quadratic and finding standard form...

-1.5x^2+255x+0

**earboth** · November 14th 2007, 12:19 AM

Originally Posted by nikkaloo

Okay maybe im thinking too hard but im having a terrible time completing the square of this quadratic ...

-1.5x^2+255x+0

Hello,

I can help you with completing the square:

$-1.5x^2+255x+0=-1.5(x^2-170x)= -1.5\left(x^2-170x+\left(\frac{170}{2}\right)^2-85^2\right)$ $=-1.5((x-85)^2-85^2) = -1.5(x-85)^2+1.5 \cdot 85^2 = -1.5(x-85)^2+10837.5$

**Jhevon** · November 14th 2007, 05:01 AM

the form the quadratic is in after completing the square is the standard form. namely, the form:

$y = a(x - h)^2 + k$

which is the form earboth's answer is in

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