Evaluate the following integrals: $\int\left(2 \mathrm{x}^{2}+3\right) \sqrt{\mathrm{x}+2} \mathrm{dx}$
Let $\mathrm{I}=\int\left(2 \mathrm{x}^{2}+3\right) \sqrt{\mathrm{x}+2} \mathrm{~d} \mathrm{x}$
Substituting $x+2=t \Rightarrow d x=d t$
$\Rightarrow I=\int\left[2(t-2)^{2}+3\right] \sqrt{t} d t$
$\Rightarrow I=\int\left[2 t^{2}-8 t+8+3\right] \sqrt{t} d t$
$\Rightarrow I=\int\left[2 t^{\frac{5}{2}}-8 t^{\frac{3}{2}}+11 \frac{1}{2}\right] d t$
$\Rightarrow I=\frac{4}{7} t^{\frac{7}{2}}-\frac{16}{5} t^{\frac{5}{2}}+\frac{22}{3} t^{\frac{3}{2}}+c$
$\Rightarrow \mathrm{I}=\frac{4}{7}(\mathrm{x}+2)^{\frac{7}{2}}-\frac{16}{5}(\mathrm{x}+2)^{\frac{5}{2}}+\frac{22}{3}(\mathrm{x}+2)^{\frac{3}{2}}+\mathrm{c}$
$\therefore \int\left(2 x^{2}+3\right) \sqrt{x+2} d x=\frac{4}{7}(x+2)^{\frac{7}{2}}-\frac{16}{5}(x+2)^{\frac{5}{2}}+\frac{22}{3}(x+2)^{\frac{3}{2}}+c$
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All Study Material
- JEE Main
- Exam Pattern
- Previous Year Papers
- PYQ Chapterwise
- Physics
- Kinematics 1D
- Kinemetics 2D
- Friction
- Work, Power, Energy
- Centre of Mass and Collision
- Rotational Dynamics
- Gravitation
- Calorimetry
- Elasticity
- Thermal Expansion
- Heat Transfer
- Kinetic Theory of Gases
- Thermodynamics
- Simple Harmonic Motion
- Wave on String
- Sound waves
- Fluid Mechanics
- Electrostatics
- Current Electricity
- Capacitor
- Magnetism and Matter
- Electromagnetic Induction
- Atomic Structure
- Dual Nature of Matter
- Nuclear Physics
- Radioactivity
- Semiconductors
- Communication System
- Error in Measurement & instruments
- Alternating Current
- Electromagnetic Waves
- Wave Optics
- X-Rays
- All Subjects
- Physics
- Motion in a Plane
- Law of Motion
- Work, Energy and Power
- Systems of Particles and Rotational Motion
- Gravitation
- Mechanical Properties of Solids
- Mechanical Properties of Fluids
- Thermal Properties of matter
- Thermodynamics
- Kinetic Theory
- Oscillations
- Waves
- Electric Charge and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Thermoelectric Effects of Electric Current
- Heating Effects of Electric Current
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Wave
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics: Materials, Devices and Simple Circuits.
- Chemical Effects of Electric Current,