Evaluate \(\int_{-2}^{3} (3x^{2} - 2x - 12) \mathrm {d} x\)
FURTHER MATHEMATICS
WAEC 2012
Evaluate \(\int_{-2}^{3} (3x^{2} - 2x - 12) \mathrm {d} x\)
- A. -30
- B. -18
- C. -6
- D. 6
Correct Answer: A. -30
Explanation
\(\int (3x^{2} - 2x - 12) \mathrm {d} x = \frac{3x^{2 + 1}}{2 + 1} - \frac{2x^{1 + 1}}{2} - 12x\)
= \(x^{3} - x^{2} - 12x\)
\((x^{3} - x^{2} - 12x)|_{-2}^{3} = ((3^{3}) - (3^{2}) - 12(3)) - ((-2^{3}) - (-2^{2}) - 12(-2))\)
= \((27 - 9 - 36) - (-8 - 4 + 24) = -18 - 12 = -30\)
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