# General--> standard form

• November 13th 2007, 09:31 PM
nikkaloo
General--> standard form
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
• November 14th 2007, 12:19 AM
earboth
Quote:

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,

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