Question

3x² + 21x = 12, can someone explain to me how to find the value of x?

Answer 1

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

Answer 2

yes, its something ive been having troubles with.

Answer 3

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

Answer 4

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

Answer 5

yeah.

Answer 6

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

Answer 7

3x² + 21x + 2 = (0?)

a = 3
b = 21
c = 2

Answer 8

We need to subtract 2-14=?

Answer 9

3x² + 21x = 12?

Answer 10

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

Answer 11

i think i figured it out now, thanks

Answer 12

what did you get?