Nick is solving the equation \[3x^2 = 20 - 7x\] with the quadratic formula.

what values should he use for a, b, and c?

a. a = 3
b = 20
c = -7

b. a = 3
b = -7
c = 20

c. a = 3
b = 7
c = -20

d. a = 3
b = -20
c = 7

Okay so we know that the equation for the quadratic formula is x = -b+/- (sqr) b^2 - 4ac.
Well the way to plug the numbers in is by using this equation: Ax^2 + Bx + C = 0 :)
S if you use your equation : 3x^2 = 20 - 7x
First you have to move everything to one side.
So it'll look like this:
3x^2 = 20 - 7x
-20      -20
3x^2 - 20 = -7x
+7x             +7x
3x^2 - 20 + 7x = 0
So remember Ax^2 +Bx+ C= 0
3 = A
7 = B
-20 = C
So the answer is C :)