# WRITING THE GIVEN STATEMENT INTO QUADRATIC AND SOLVE THEM

Writing the Given Statement into a Quadratic Equation and Solve them :

In this section, we will see some example problems to show how to write the given statement into a quadratic equation.

## Writing the Given Statement into a Quadratic Equation and Solve them

Example 1 :

Represent the following situations in the form of quadratic equations:

(i) The area of a rectangular plot is 528 m². The length of the plot (in meters) is one more than twice its breadth. We need to find the length and breadth of the plot.

Solution :

Area of rectangular plot = 528 m²

let "x" be the breadth of the plot

length of the plot = 2 x + 1

(2 x + 1) x = 528

2 x² +  x - 528 = 0

Example 2 :

the product of two consecutive positive integers is 306. We need to find the integers.

Solution :

Let x and x + 1 are the two consecutive positive integers

product of these integers  =  306

x (x + 1)  =  306

x² + x  =  306

x² + x - 306  =  0

Example 3 :

Rohan's mother is 26 years older than him. The product of their ages (in years) 3 years from now will be 360. We would like to find Rohan's present age.

Solution :

Let "x" be Rohan's age

Let "x + 26" be Rohan's mother's age

Three years later Rohan and his mother ages will be  x + 3 and x + 29 respectively

(x + 3) (x + 29)  =  360

x² + 29 x + 3 x + 87  =  360

x² + 32 x + 87 - 360  =  0

x² + 32 x - 273  =  0

Example 4 :

A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/hr less, then it would have taken 3 hours more to cover the same distance. We need to find the speed of the train.

Solution :

Distance to be covered = 480 km

Speed of the train = x km/hr

Time = Distance/speed

Time taken by the train to cover 480 km distance in x km/hr = 480/x

Time taken by the train to cover 480 km distance in 8 km/hr less speed = 480/(x - 8)

3  =  [480/x] - [480/(x - 8)]

3  =  480 [ (1/x) - (1/(x-8))]

3/480  =  [(x - 8 - x)/(x(x - 8))]

1/160  =  -8/(x² - 8 x)

(x² - 8 x)  =  -8 (160)

x² - 8 x + 1280  =  0 After having gone through the stuff and examples,  we hope that the students would have understood, writing the given statement into a quadratic equation

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