Posted by Emma on Tuesday, July 22, 2014 at 10:17pm.
Which of the following cannot be solved using the quadratic formula?
A.3x^2x+3=3x^2
B. 0=x^2
C. 0=2x^21
D. x^2+3x2=4x^25x1
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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