MCQ
જો $\left( {\int_{\,0}^{\,a} {x\,dx} } \right) \le (a + 4),$ તો
- A$ 0 \le a \le 4$
- ✓$ - 2 \le a \le 4$
- C$ - 2 \le a \le 0$
- D$a \le - 2\,\,{\rm{or}}\,\,a \ge 4$
$ \Rightarrow \frac{{{a^2}}}{2} \le a + 4$
$ \Rightarrow {a^2} \le 2a + 8$
$ \Rightarrow {a^2} - 2a - 8 \le 0$
$ \Rightarrow (a - 4)(a + 2) \le 0$
$ \Rightarrow - 2 \le a \le 4$.
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