We will learn about the formation of quadratic equation in one variable from a mathematical problem.
Consider the following examples:
1. Length of a rectangular park is 40 metres more than its breadth. Area of the park is 2304 square metres.
Now we will learn how to express this statement in Mathematical language
Let the breadth of the rectangular park = x metres
Therefore, length of the rectangular park = (x+ 40) metres
So, area of the rectangular park = (x + 40) ∙ x square metres
According to the problem we get,
(x + 40) ∙ x = 2304
or, x^2 + 40x = 2304
or, x2 + 40x - 2304 = 0 .................... (i)
OR,
Let the length of the rectangular park = x metres
Therefore, the breadth of the rectangular park =(x - 40) metres
Area of the rectangular park = x(x - 40) square metres
According to the problem we get,
x(x - 40) = 2304
or,x2 - 40x - 2304 = 0 .................... (ii)
Both of (i) and (ii) are quadratic equations.
2. Mike 3 hours more to do a piece of work than Davis. They together complete it in 2 hours.
Let Davis complete a piece of work in x hours
and Mike complete the same work in (x + 3) hours.
Therefore, in 1 hour Davis complete 1/x part of the work
and in 1 hour Make complete 1/(x + 3) part of the work.
Hence, in 1 hour they togetherly complete 1/x + 1/(x + 3) of the part.
According to the problem we get,
1/x + 1/(x + 3) = ½ .................... (i)
Or,
Let Mike complete a piece of work in x hours
and Davis complete the same work in (x - 3) hours.
Therefore, in 1 hour Davis complete 1/(x - 3) part of the work.
and in 1 hour Mike complete 1/x part of the work
Hence, in 1 hour they togetherly complete 1/(x- 3) + 1/x of the part.
According to the problem we get,
1/(x - 3) + 1/x = ½ .................... (ii)
Both of (i) and (ii) are quadratic equations.
Quadratic Equation
Introduction to Quadratic Equation
Formation of Quadratic Equation in One Variable
General Properties of Quadratic Equation
Methods of Solving Quadratic Equations
Examine the Roots of a Quadratic Equation
Problems on Quadratic Equations
Quadratic Equations by Factoring
Word Problems Using Quadratic Formula
Examples on Quadratic Equations
Word Problems on Quadratic Equations by Factoring
Worksheet on Formation of Quadratic Equation in One Variable
Worksheet on Quadratic Formula
Worksheet on Nature of the Roots of a Quadratic Equation
Worksheet on Word Problems on Quadratic Equations by Factoring
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