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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:
- Option A is correct.
- Option B is incorrect.
- C is incorrect.
- 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 /
