Option 2 : 53

**Given:**

The given expression is (x - 9)(8 - 5x).

**Concept:**

A coefficient is a numerical or constant quantity placed before and multiplying the variable in an algebraic expression.

**Calculation:**

(x - 9)(8 - 5x)

⇒ 8(x - 9) - 5x(x - 9)

⇒ 8x - 72 - 5x^{2} + 45x

⇒ - 5x^{2 }+ 53x - 72

**∴**** The coefficient of x in (x - 9)(8 - 5x) is 53.**

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