# Math Help - quadratic formula

3x(x-3)= -4

Help!
Thanks

2. $3x(x-3)= -4$

$3x^2-9x= -4$

$3x^2-9x+4= 0$

$a=3,b=-9,c=4$

Was that o.k?

3. Originally Posted by kelsikels
3x(x-3)= -4
$3x^2-9x+4=0???????$

4. what about the second part?

5. Originally Posted by kelsikels
What second part?
Do you mean the complete solution?
Oh no! That is your job!

6. Originally Posted by kelsikels
The formula is $x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$

Pickslides has given you values for a, b and c

7. Originally Posted by pickslides

$a=3,b=-9,c=4$
Substitute these values into

$x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}$

8. here's a graph of $3x^2-9x+4= 0$ if it is of any interest
the x intercepts are not as obvious as they look.