Find the coefficient of $x$ in $(x + 2)(x + 9)$.

Find the coefficient of $x$ in $(x + 2)(x + 9)$.
  1. $11$
  2. $18$
  3. $7$
  4. $2$

Solution

Coefficient of $x$ = $a + b = 2 + 9 = 11$.

Asked in: IMO

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