Which of the following is a quadratic polynomial?

(i) 2 x²+1 (ii) x² + (iii) (iv)

(i) On solving the equations,

2x² + 1 = 0

Re-writing in the format of ax² + bx + c = 0

(2)x² + (0)x + 1 = 0

a = 2 b = 0 & c = 1.

So, following the ideal pattern of a quadratic polynomial 2x² + 1 is a quadratic polynomial.

(ii) On solving the equations,

it can’t be re-written in the format of ax² + bx + c = 0

So, following the ideal pattern of a quadratic polynomial, x²+ is not a quadratic polynomial.

(iii) On solving the equations,

it can’t be re-written in the format of ax² + bx + c = 0

So, following the ideal pattern of a quadratic polynomial, is not a quadratic polynomial.

(iv) On solving the equations,

3√(x²+ 1) + x = 0

it can’t be re-written in the format of ax² + bx + c = 0

So, following the ideal pattern of a quadratic polynomial, 3√(x²+ 1) + x = 0 is not a quadratic polynomial.