• Jul 17th 2011, 08:09 PM
raimel
Hii... I need help with some of this excersises...

1) Solve 3x2 + 4x = 2
2) Solve x2 + 9x + 9 = 0
3) Solve 2x2 = 14x + 20

butt the answer cannot be like x= something and x= something else... it must be likehttp://learn.flvs.net/webdav/assessm...5_03c_4_01.gif ... or i don't know... Please help because I don't know how to dp that.. :D thanks...!
• Jul 17th 2011, 08:12 PM
pickslides
For $\displaystyle ax^2+bx+c = 0 \implies x = \frac{-b\pm \sqrt{b^2-4ac}}{2a}$
• Jul 17th 2011, 08:15 PM
mr fantastic
Quote:

Originally Posted by raimel
Hii... I need help with some of this excersises...

1) Solve 3x2 + 4x = 2
2) Solve x2 + 9x + 9 = 0
3) Solve 2x2 = 14x + 20

butt the answer cannot be like x= something and x= something else... it must be likehttp://learn.flvs.net/webdav/assessm...5_03c_4_01.gif ... or i don't know... Please help because I don't know how to dp that.. :D thanks...!

1) Re-arrange: 3x^2 + 4x - 2 = 0.

2) .....

3) Re-arrange: 2x^2 - 14x - 20 = 0.

Now solve each of them using the method you have been taught. You might need to go back to your class notes or textbook to review that material. If you need more help, please show what you've done and say where you get stuck. And please fix the link.