how do I tell when an equation is a quadratic equation?

Question

anonymous · Answer

If the highest power in the equation is a 2, you have a quadratic equation.

anonymous · Answer

and it does not have any fraction as an exponent for any variable

gabylovesyou · Answer

the highest power or the highest power added together

anonymous · Answer

$$ax^2 + bx + c = 0$$
This is the general form of a quadratic equation.
As long as the highest power in the equation is a 2, and all powers are integers (as bjesquijo pointed out), it's a quadratic.

amistre64 · Answer

fractions are fine for equations

amistre64 · Answer

lol, i misread "exponent" as coefficient ...

amistre64 · Answer

$$au+b\sqrt{u}+c$$this is still quadratic - ish

gabylovesyou · Answer

Which equation is a quadratic equation?

5x − 2 = y NOT THE ANSWER 

y + 15x^2 = (3x − 2)(5x + 7)

y = 3x(5 − x) + 7 NOT THE ANSWER

y + 2 = (3x^2 + 10)(x − 1)

amistre64 · Answer

might be good to distinguish between a polnomial (only integer exponents) and an equation (highest degree term)

amistre64 · Answer

one of yout "not the answers" is a quadratic

anonymous · Answer

@amistre64 I guess you could substitute u = √x to make it a "normal" quadratic.

amistre64 · Answer

i see a cubic, 2 linears, and a quadratic

gabylovesyou · Answer

C is a quadratic ?