Exemplar-Exercise Problems II — task. Mathematics CBSE, Class 9.

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1. The coefficient of x in the expansion of \((x + 3)\) isThe coefficient of

$x$ in the expansion of

$(x + 3)^3$ is

$27$
$18$
$1$
$9$

2. If

$\frac{x}{y}+\frac{y}{x}=-1$ ,

$x,y\neq 0$ , the value of

$x^3-y^3$ is

$1$
$0$
$\frac{1}{2}$
$-1$

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