Which of the following is a quadratic polynomial ?

Options

A. `x^(3)-7x+2`
B. `7x^(5)-x(x+2)`
C. `2x(x+5)+1`
D. `2x-1`

Explanation

In the polynomial `x^(3)-7x+2`, the highest power of the variable x is 3.
`:.` it is not a quadratic polynomialo.
In the polynomial `7x^(5)-x(x+2)` the highest power of the variable x is 5.
`:.` it is also not quadratic polynomial.
The polynmial `2x(x+5)+1=2x^(2)+10x+1` can be expressed in the form `ax^(2)+bx+c`, where `ane0`.
`:.` it is a quadratic polynomial.
In the polynomial 2x-1 the highest power of the variable x is 1. So it is not a quadratic polynomial.