Question

Which represents a quadratic function ?

Answer 1

b

Explanation:

lol dude answered it already

Answer 2

`\boxed{\boxed{B.\ f(x)=(3)/(4)x^2+2x-5}}`

Explanation:

Quadratic function-

It is a function that can be represented by an equation of the form
`f = ax^2 + bx + c`, where
`a\\eq 0`

In a quadratic function, the greatest power of the variable is 2.

As in the first option the highest power is 3, so it is not a quadratic function.

Even though the power of x is 2 in the third option, but as it is in the denominator, so the overall power of x becomes -2. Hence it is not a quadratic function.

As the coefficient of
`x^2` is 0 in case of fourth option, so it is not a quadratic function.

Equation in option 2 satisfies all the conditions of quadratic function, hence it is the quadratic function.