New Arrivals

# Class 10

## Exercise 1.1 (Math 10)

Question 1.   Write the following quadratic equations in the standard form and point out pure quadratic equations. (i).          (x + 7)(x − 3) = −7 Solution: The given quadratic equation is         (x + 7)(x − 3) = −7          (i) Multiplying the expressions (x + 7) and (x − 3) in equation (i) with each other, we have       ...

## Solution of Quadratic Equation by factorization

In this method, write the quadratic equation in the standard form as ax2 + bx + c = 0          (i) If two numbers r and s can be found for the equation (i) such that r + s = b and rs = ac then ax2 + bx + c can be factorized into two linear factors. Example Solve the ...

## Simple Harmonic Motion and Waves

A body is said to be vibrating if it moves back and forth or to and fro about a point. Another term for vibration is oscillation. A special kind of vibratory or oscillatory motion is called the Simple Harmonic Motion (SHM). Simple Harmonic Motion (SHM) A body is said to be executing Simple Harmonic Motion (SHM) if acceleration of the ...

## Little by Little One Walks Far!

The last couple of years have been a long bumpy ride for me, as they have for everyone of my age. The experiences might be different but everyone has gone through many of the same “teenage” circumstances as I have done. All of them have dealt with them in their own way. As a personal participant in this “game”, we ...

## Television vs. Newspapers

News coverage over television is different from reading newspapers. Newspapers were primarily established to cover the news and later on they added entertainment. On the other side television was mainly invented for entertainment and then it became an effective news medium. Now television news has become a powerful rival to newspapers. Though both of these medium cover the news effectively, ...

## Solution of Quadratic Equation by Completing Square

To solve a quadratic equation by the method of completing square is illustrated through the following examples. Example Solve the equation x2 − 3x − 4 = 0 by completing square. Solution: x2 − 3x − 4 = 0          (i) Shifting constant term −4 to the right, we have x2 − 3x = 4          (ii) Adding the square of ...

## First Aid

We all need help at times in our lives. Sometimes we may have accidents and we may get hurt. When we are injured or suddenly become unwell, we need some one to help us — someone who knows what to do. It is the temporary and immediate help. This timely assistance, comprising of simple medical techniques, is most critical to ...

## Chemical Equilibrium

Generally, we presume that most chemical and physical changes proceed to completion. A complete reaction is one in which all reactants have been converted into products. However, most chemical reactions do not go to completion because products react themselves to form the reactants. As a result, after sometime no further change takes place. Quantities of reactants and products remain unchanged, ...