Jump to
- Chapter 1- Rational and Irrational Numbers
- Chapter 2- Compound Interest [Without Using Formula
- Chapter 3- Compound Interest [Using Formula
- Chapter 4- Expansions
- Chapter 5- Factorisation
- Chapter 6- Simultaneous Equations
- Chapter 7- Indices [exponents]
- Chapter 8- Logarithms
- Chapter 9- Triangles [Congruency in Triangles]
- Chapter 10- Isosceles Triangle
- Chapter 11- Inequalities
- Chapter 12- Mid-Point and Its Converse
- Chapter 13- Pythagoras Theorem
- Chapter 14- Rectilinear Figures
- Chapter 15- Construction of Polygons
- Chapter 16- Area Theorems
- Chapter 17- Circles
- Chapter 18- Statistics
- Chapter 19- Mean and Median
- Chapter 20- Area and Perimeter of Plane Figures
- Chapter 21- Solids
- Chapter 22- Trigonometrical Ratios
- Chapter 23- Trigonometrical Ratios of Standard Angles
- Chapter 24- Solution Of Right Triangles
- Chapter 25- Complementary angles
- Chapter 26- Co-ordinate Geometry
- Chapter 27- Graphical Solution
- Chapter 28- Distance Formula
Selina Solutions Class 9 Mathematics Solutions for Exercise 1(C) in Chapter 1 - Chapter 1- Rational and Irrational Numbers
Prev
If 𝒙 = 𝟏 − √𝟐, find the value of \left(x+\frac{1}{x}\right)^{3}
Answer:
\begin{aligned} &\text { Qwen that } x=1-2\\ &\frac{1}{2}-\frac{1}{1-\sqrt{2}} \cdot \frac{1+\sqrt{2}}{1+\sqrt{2}}\\ &=\frac{1}{1}=\frac{t+r}{1-1+2 !}\\ &[\sin c=\operatorname{san} b x]+t\}=a-t^{2}\\ &=\frac{1}{x}-\frac{1+\sqrt{2}}{1-x}\\ &=\frac{1}{x}=\frac{1+\sqrt{2}}{-1}\\ &\left.\Rightarrow \frac{1}{x}=-\frac{1}{1} 1+\sqrt{2}\right\} \quad(1)\\ &\Rightarrow\left(x-\frac{t}{x}\right)=1-22+t+\sqrt{2}\\ &\Rightarrow\left[x-\frac{1}{2}\right]-2\\ &\Rightarrow\left(x-\frac{1}{x}\right)^{2} \cdot 2^{x}\\ &-\left(x-\frac{1}{x}\right)^{2}-8 \end{aligned}
Facebook
Whatsapp
Copy Link
Chapters
Lido
Courses
Quick Links
Terms & Policies
Terms & Policies
Connect with us on social media!
2022 © Quality Tutorials Pvt Ltd All rights reserved