Framing Quadratic Equation2





In this page framing quadratic equation2 we are going to see how to construct any quadratic equation with given roots.

Question 4:

Construct a quadratic equation whose two roots are 24 and -3

Solution:

Here two roots are 24 and -3

α = 24

β = -3

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

Sum of roots (α + β) = 24 + (-3)

                             = 24 - 3

                             = 21

Product of roots (α β) = 24(-3)

                              = -72

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

x² - 21 x + (-72) = 0

x² - 21 x - 72 = 0


Question 5:

Construct a quadratic equation whose two roots are -1 and -5

Solution:

Here two roots are -1 and -5

α = -1

β = -5

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

Sum of roots (α + β) = -1 + (-5)

                             = -1 - 5

                             = -6

Product of roots (α β) = -1(-5)

                              = 5

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

x² - (-6) x + 5 = 0

x² + 6 x + 5 = 0


Question 6:

Construct a quadratic equation whose two roots are -7 and 5

Solution:

Here two roots are -7 and 5

α = -7

β = 5

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

Sum of roots (α + β) = -7 + 5

                             = -2

Product of roots (α β) = -7(5)

                              = -35

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

x² - (-2) x + (-35) = 0

x² + 2 x - 35 = 0




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