Which one of these is quadratic? A) `y=x^2+3x` B)  `f(x) = x (4-x)-3` C) `3x^2-2=5x`



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llltkl's profile pic

Posted on (Answer #1)

A quadratic equation in x is an equation that can be written in the general form:


where, a, b and c are real numbers with ‘a’ having a non-zero value.

A quadratic equation is also defined as a univariate polynomial equation of the second degree.

Options A) and B) contains equations that are not univariate, hence these two do not represent quadratic equations.

The equation in option C) is `3x^2-2=5x`

Which can be rewritten as:


This is definitely a quadratic equation, in x.

Thus, the correct answer is option C).

atyourservice's profile pic

Posted on (Answer #2)

c. because it has an a,b and c

givingiswinning's profile pic

Posted on (Answer #3)


taangerine's profile pic

Posted on (Answer #4)

A quadratic is essentially ax^2+bx+c. 

And, only choice C has those characteristics. 

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