Definite Integration
General
Grade 12
Question:
Evaluate $\int_{2}^{3} \frac{\sqrt{x}}{\sqrt{5-x}+\sqrt{x}} dx$
Step-by-Step Solution
Key Concept: General
<div>$I = \int_{2}^{3} \frac{\sqrt{x}}{\sqrt{5-x}+\sqrt{x}} dx$<br>$I = \int_{2}^{3} \frac{\sqrt{3+2-x}}{\sqrt{5-(3+2-x)}+\sqrt{3+2-x}} dx$<br>$I = \int_{2}^{3} \frac{\sqrt{5-x}}{\sqrt{x}+\sqrt{5-x}} dx$<br>$2I = \int_{2}^{3} \left( \frac{\sqrt{5-x}+\sqrt{x}}{\sqrt{x}+\sqrt{5-x}} \right) dx \Rightarrow 2I = \int_{2}^{3} dx$<br>$2I = (x)_{2}^{3} \Rightarrow 2I = 1$<br>$I = \frac{1}{2}$</div>
Correct Answer: 1/2