Given that \(\frac{\mathrm d y}{\mathrm d x} = \sqrt{x}\), find y.
FURTHER MATHEMATICS
WAEC 2013
Given that \(\frac{\mathrm d y}{\mathrm d x} = \sqrt{x}\), find y.
- A. \(2x^{\frac{3}{2}} + c\)
- B. \(\frac{2}{3}x^{\frac{3}{2}} + c\)
- C. \(\frac{3}{2}x^{\frac{3}{2}} + c\)
- D. \(\frac{2}{3}x^{2} + c\)
Correct Answer: B. \(\frac{2}{3}x^{\frac{3}{2}} + c\)
Explanation
\(\frac{\mathrm d y}{\mathrm d x} = \sqrt{x} = x^{\frac{1}{2}}\)
\(y = \int x^{\frac{1}{2}} \mathrm {d} x\)
= \(\frac{x^{\frac{1}{2} + 1}}{\frac{1}{2} + 1} + c = \frac{x^{\frac{3}{2}}}{\frac{3}{2}} + c \)
= \(\frac{2}{3}x^{\frac{3}{2}} + c\)
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