Search SchoolNGR

Sunday, 01 March 2026
Register . Login

Simplify \(\frac{5+\sqrt{7}}{3+\sqrt{7}}\)

Simplify \(\frac{5+\sqrt{7}}{3+\sqrt{7}}\)
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A 17-√7
  • B 4-√7
  • C 15+√7
  • D 7-√7
Correct Answer: Option B
Explanation:
\(\frac{5+\sqrt{7}}{3+\sqrt{7}}=\frac{5+\sqrt{7}}{3+\sqrt{7}}\times \frac{3-\sqrt{7}}{3-\sqrt{7}}\\
=\frac{(5+\sqrt{7})(3-\sqrt{7})}{3^2 - \sqrt{7}^2}\\
=\frac{15-5\sqrt{7}+3\sqrt{7}-7}{9-7}\\
=\frac{8-2\sqrt{7}}{2}\)
Factorize then divide by 2
\(=\frac{2(4-\sqrt{7}}{2}\\
=4-\sqrt{7}\)

Share question on: