Write the coefficients of x² in each of the following: (i) 2 + x² + x (ii) 2 - x² + x³ (iii) π2x² + x (iv) √2x

Coefficient of x² in ax² + bx + c = 0 is a.
Hence, coefficients of x² in
(i) 2 + x² + x is 1
(ii) 2 - x² + x³ is -1
(iii) π2x² + x is π2
(iv) √2x is 0