Which of the following is a quadratic equation? 1) y=2^x 2) y=x^2+2x^3+4 3) 4x^2-1 4) y=2x

Question

Which of the following is a quadratic equation?

1)
`y=2^x`
2)
`y=x^2+2x^3+4`
3)
`4x^2-1`
4)
`y=2x`

Answer 1

3) 4x² -1

Explanation:

A quadratic equation is a 2nd-degree polynomial equation.

1) an exponential equation (the variable is in the exponent)

2) a cubic equation (degree = 3)

3) a quadratic equation

4) a linear equation (degree = 1)