## Here you will learn Practice set 2.1 of 10th Maths 1 Quadratic Equations by Mahesh Prajapati.

You have studied polynomials last year. You know types of polynomials according to their degree. When the degree of polynomial is 1 it is called a linear polynomial and if degree of a polynomial is 2 it is called a quadratic polynomial.

## Standard form of quadratic equation

The equation involving one variable and having 2 as the maximum index of the variable is called the quadratic equation.

General form is ax^{2 }+ bx + c = 0

In ax^{2} + bx + c = 0, a, b, c are real numbers and a is not equal to 0.

ax^{2} + bx + c = 0 is the general form of quadratic equation.

**Click here for Practice Set 1.1 Elimination Method**

## Roots of a quadratic equation

In the previous class you have studied that if value of the polynomial is zero for x = a then (x – a) is a factor of that polynomial. That is if p(x) is a polynomial and p(a) = 0 then (x – a) is a factor of p(x). In this case ’a’ is the root or solution of p(x) = 0

## Practice Set 2.1

- Write any two quadratic equations.
- Decide which of the following are quadratic equations.

(1) x^{2}+ 5 x – 2 = 0 (2) y^{2}= 5 y – 10 (3) y^{2}+ 1/y = 2

(4) x +1/ x = -2 (5) (m + 2) (m – 5) = 0 (6) m^{3}+ 3 m^{2}-2 = 3 m^{3} - Write the following equations in the form ax2 + bx + c = 0, then write the values of a, b, c for each equation.

(1) 2y =10 – y^{2}(2) (x – 1)^{2}= 2 x + 3 (3) x^{2}+ 5x = -(3 – x)

(4) 3m^{2 }= 2 m^{2}– 9 (5) P (3 + 6p) = -5 (6) x^{2}– 9 = 13 - Determine whether the values given against each of the quadratic equation are the

roots of the equation.

(1) x^{2}+ 4x – 5 = 0 , x = 1, -1 (2) 2m^{2}– 5m = 0 , m = 2, 5/2 - Find k if x = 3 is a root of equation kx
^{2}– 10x + 3 = 0 .