Framing Quadratic Equation1





In this page framing quadratic equation1 we are going to see how to construct any quadratic equation with given roots.

Question 1:

Construct a quadratic equation whose two roots are -2 and -3

Solution:

Here two roots are -2 and -3

α = -2

β = -3

General form of any quadratic equation x² - (α + β) x + αβ = 0

Sum of roots (α + β) = -2 + (-3)

                            = - 2 - 3

                            = -5

Product of roots (α β) = -2(-3)

                              = 6

Now let us write the quadratic equation with sum and product of roots

x² - (-5) x + (6) = 0

x² + 5 x + 6 = 0

x² +  x - 12 = 0


Question 2:

Construct a quadratic equation whose two roots are 5 and -3

Solution:

Here two roots are 5 and -3

α = 5

β = -3

General form of any quadratic equation x² - (α + β) x + αβ = 0

Sum of roots (α + β) = 5 + (-3)

                            = 5 - 3

                            = 2

Product of roots (α β) = 5(-3)

                              = -15

Now let us write the quadratic equation with sum and product of roots

x² -2 x + (-15) = 0

x² - 2 x - 15 = 0


Question 3:

Construct a quadratic equation whose two roots are 1 and 3

Solution:

Here two roots are 1 and 3

α = 1

β = 3

General form of any quadratic equation x² - (α + β) x + αβ = 0

Sum of roots (α + β) = 1 + 3

                            = 4

Product of roots (α β) = 1(3)

                              = 3

Now let us write the quadratic equation with sum and product of roots

x² - 4 x + 3 = 0




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