Share

# Using Properties of Proportion Solve for X: Sqrt(X + 1) + Sqrt(X - 1))/(Sqrt(X + 1) - Sqrt(X - 1)) = (4x - 1)/2 - Mathematics

Course

#### Question

Using properties of proportion solve for x:

(sqrt(x + 1) + sqrt(x - 1))/(sqrt(x + 1) - sqrt(x - 1)) = (4x - 1)/2

#### Solution

(sqrt(x + 1) + sqrt(x - 1))/(sqrt(x + 1) - sqrt(x - 1)) = (4x - 1)/2

Applying componendo and dividendo

(sqrt(x + 1) + sqrt(x - 1) + sqrt(x + 1) - sqrt(x - 1))/(sqrt(x + 1) + sqrt(x - 1) - sqrt(x + 1) + sqrt(x - 1)) = (4x - 1 + 2)/(4x - 1 - 2)

(2sqrt(x + 1))/(2sqrt(x - 1)) = (4x + 1)/(4x - 3 )

Squaring both sides

(x + 1)/(x - 1) = (16x^2 + 1 + 8x )/(16x^2 + 9 - 24x)

Applying componedo and dividendo

(x + 1 + x - 1)/(x + 1 - x + 1) = (16x^2 + 1 + 8x + 16x^2 + 9 - 24x)/(16x^2 + 1 + 8x - 16x^2 - 9 + 24x)

(2x)/2 = (32x^2 + 10 - 16x )/(32x - 8)

x = (16x^2 + 5 - 8x)/(16x - 4)

16x^2 - 4x = 16x^2 + 5 - 8x

4x = 5

x = 5/4

Is there an error in this question or solution?

#### APPEARS IN

Selina Solution for Concise Mathematics for Class 10 ICSE (2020 (Latest))
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Exercise 7(C) | Q: 11.2 | Page no. 102

#### Video TutorialsVIEW ALL [1]

Solution Using Properties of Proportion Solve for X: Sqrt(X + 1) + Sqrt(X - 1))/(Sqrt(X + 1) - Sqrt(X - 1)) = (4x - 1)/2 Concept: Proportions.
S