If $p(x) = 2x + 1$ and $p(a) = 5$, then $a$ is

If $p(x) = 2x + 1$ and $p(a) = 5$, then $a$ is
  1. $2$
  2. $3$
  3. $5$
  4. $\dfrac{5}{2}$

Solution

$2a + 1 = 5 \Rightarrow a = 2$.

Asked in: MH-SSC-9

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