SOLUTION: how do you solve this?
-9=-2x^2+6x
Algebra.Com
Question 596611: how do you solve this?
-9=-2x^2+6x
Answer by dhartman0220(8) (Show Source): You can put this solution on YOUR website!
-2x^2+6x+9=0
its quadratic so either use the quadratic formula
or complete the square....
factor out -2
-2(x^2-3x-9/2)=0
x^2-3x=9/2
add 9/4 to both sides
x^2-3x+9/4=9/2 + 9/4
x^2-3x+9/4=[x-(3/2)]^2
so [x-(3/2)]^2 = 27/4
sqrt both sides x-(3/2) = (+-)sqrt(27/4)
sqrt(27/4)=3sqrt3/2
add 3/2 to both sides.....
x=[3(+-)3sqrt3]/2
RELATED QUESTIONS
How do do you solve... (answered by KMST)
How do I solve:... (answered by checkley71)
How do you simplify... (answered by Fombitz)
6x-(3-2x)>3x+2 how do you do... (answered by rapaljer)
How do you solve this equation? {{{ 2(6x-1)+2(2x+5)=120... (answered by nerdybill)
how do you solve... (answered by jim_thompson5910)
How do you solve... (answered by lynnlo)
How do I solve this?
{{{ 2x=6x... (answered by Alan3354)
how do you solve for this 2x – 9 >... (answered by jim_thompson5910)