Find the value of the polynomial 5x - 4x+ 3 at x=-1

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JKSSB SI Official Paper (Held On: 12 Dec 2022 Shift 2)
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  1. 8
  2. -9
  3. 3
  4. -6

Answer (Detailed Solution Below)

Option 4 : -6
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Detailed Solution

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Given:

Polynomial = 5x - 4x2 + 3

Value of x = -1

Formula Used:

Substitute the value of the variable in the polynomial.

Calculations:

Value of polynomial at x = -1 is

5(-1) - 4(-1)2 + 3

⇒ -5 - 4(1) + 3

⇒ -5 - 4 + 3

⇒ -9 + 3 = -6

∴ The value of the polynomial at x = -1 is -6.

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