SOLUTION: I'm trying to find how to fill in the variables to the quadratic formula for 3x^2-48=0 I believe a is 3 and 38 is c, but what is b? Thanks.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: I'm trying to find how to fill in the variables to the quadratic formula for 3x^2-48=0 I believe a is 3 and 38 is c, but what is b? Thanks.      Log On


   

Question 390063: I'm trying to find how to fill in the variables to the quadratic formula for
3x^2-48=0
I believe a is 3 and 38 is c, but what is b?
Thanks.
Found 2 solutions by robertb, ewatrrr:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
a = 3, b = 0, and c = -48.

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,        

solving the following using the Quadratic formula

3x^2-48=0   Note b = 0, in this example

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

x+=+%280+%2B-+sqrt%28+576+%29%29%2F%286%29+

x+=+%280+%2B-+24%29%2F%286%29+

  x = ± 4



Note: Solving by factoring

3x^2-48=0  

3(x^2-16)=0  

3(x-4)(x+4)=0  

(x-4)=0

   x = 4

(x+4)= 0

   x = -4