NCERT Class 12 · Ch 7 Exercise 7.8 · Q3
NCERT Class 12 Maths · Chapter 7 Integrals · Exercise 7.8 Question 3
Evaluate \(\int\limits_{1}^{2} \left(4 x^{3} - 5 x^{2} + 6 x + 9\right)\, dx\).
💡 Concept Hints
- Identify the domain and the inner and outer functions, or the relevant one-sided limits.
- Apply the appropriate differentiation or limit rule, keep all chain factors, and check exceptional points.
✅ Step-by-Step Solution
Final Answer: \(\frac{64}{3}\)
- Work on each open interval where the original integrand is real and defined.
- Use linearity and the elementary power, logarithm, trigonometric and exponential rules. Where a product x eˣ occurs use integration by parts; for rational terms split off the denominator derivative.
- An antiderivative is F(x)=\(x^{4} - \frac{5 x^{3}}{3} + 3 x^{2} + 9 x\).
- At the upper and lower limits, F(b)=\(\frac{98}{3}\) and F(a)=\(\frac{34}{3}\).
- By the fundamental theorem (using one-sided limits for any integrable endpoint), I=F(b)−F(a)=\(\frac{64}{3}\).
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