3. What are the coefficients of $x^2$ and $x^3$ in the polynomial $x^4 - 3x^3 + 6x^2 - 2x + 7$? [Page No. 18]

Coefficient of x² = 6

Coefficient of $x^3 = -3$.
Caution
Students should not confuse the coefficient of a term with the term itself. In $x^4 - 3x^3 + 6x^2 - 2x + 7$, the coefficient of $x^3$ is $-3$(with its sign), not $3$.