## anonymous one year ago 3x² + 21x = 12, can someone explain to me how to find the value of x?

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1. pooja195

Well is this meant to be one of those quadratic equations?

2. anonymous

yes, its something ive been having troubles with.

3. anonymous

whoops, the question was mistyped, here is the equasion 3x² + 21x + 2 = 14

4. pooja195

ok $\huge~\rm~ax^2+bx+c=0$ is this familiar?

5. anonymous

yeah.

6. pooja195

Alright so make your given equation = 0 then list your abc values

7. anonymous

3x² + 21x + 2 = (0?) a = 3 b = 21 c = 2

8. pooja195

We need to subtract 2-14=?

9. anonymous

3x² + 21x = 12?

10. pooja195

No... it would -12 then you would do 3x^2+21x-12=0 Now list the abc values

11. anonymous

i think i figured it out now, thanks

12. pooja195

what did you get?