posted by Emma .
Which of the following cannot be solved using the quadratic formula?
Is it C?
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.