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If f(x) = 3x³ + 4x² + x – 8, what is the value of f(-2)…

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If f(x) = 3x³ + 4x² + x – 8, what is the value of f(-2)

  • A. – 18
  • B. – 50
  • C. 30
  • D. – 24

QUICK ANSWER…

A

SOLUTION 

If f(x) = 3x³ + 4x² + x – 8, then f(-2) will be obtained by directly substituting -2 into the equation as shown below:

f(-2) = 3(-2)³ + 4(-2)² + (-2) – 8

f(-2) = 3(-8) + 4(4) + (-2) – 8

f(-2) = -24 + 16 – 2 – 8

f(-2) = – 18

Now for the right answer to the above question:

  1. Option A is correct.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is not the correct answer.

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  • The function of any number can be gotten by directly substituting into the expression for function x.
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/ culled from 2019 JAMB-UTME mathematics question 26 /

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