Posted by **Emma** on Tuesday, July 22, 2014 at 10:17pm.

Which of the following cannot be solved using the quadratic formula?

A.-3x^2-x+3=-3x^2

B. 0=x^2

C. 0=2x^2-1

D. x^2+3x-2=4x^2-5x-1

Is it C?

- Algebra -
**Reiny**, Tuesday, July 22, 2014 at 11:19pm
I would say it is A

it simplifies to -x + 3 = 0 , which is linear and not quadratic.

If you force the issue and make it look like a quadratic, it would be

0x^2 - x + 3 = 0

so a=0 , b=-1 and c = 0

BUT, in the formula we are dividing by 2a which in this case would be dividing by zero,

an operation which is slightly frowned upon in mathematics.

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