## apexsucks 4 years ago After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? Check all that apply. A. 2x2 - 3x + 10 = 2x + 21 B. 2x2 - 6x - 7 = 2x2 C. 5x2 + 2x - 4 = 2x2 D. 5x3 - 3x + 10 = 2x2

1. robtobey

A. and C. B. is linear and D. is a cubic

2. mz11235

can u explane plz...i want tolean this thing...quadratic formula..@robtobey

3. SmoothMath

I'll explain, bro.

4. SmoothMath

The quadratic formula is awesome. Basically the idea is that any polynomial where the highest exponent for x is 2, you can just plug the different coefficients into the formula, and it'll tell you what values of x make the polynomial 0. Now, the only trick is that if you have an equation like that, you have to put it in the form Ax^2 + Bx + C = 0. A, B, and C can be any constant numbers. As long as they aren't variables, you're good.

5. mz11235

thanks a lot@smoothmath

6. SmoothMath

Now, one thing... those coefficients are allowed to be 0.

7. SmoothMath

Well. As long as A isn't 0. Because in the quadratic, then you would divide by 0. But B or C can be. Just be aware of that.