Framing Quadratic Equation3





In this page framing quadratic equation3 we are going to see how to construct any quadratic equation with given roots.

Question 7:

Construct a quadratic equation whose two roots are 7 and -1

Solution:

Here two roots are 7 and -1

α = 7

β = -1

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

Sum of roots (α + β) = 7 + (-1)

                            = 7 - 1

                            = 6

Product of roots (α β) = 7(-1)

                              = -7

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

x² - 6 x + (-7) = 0

x² - 6 x -7 = 0


Question 8:

Construct a quadratic equation whose two roots are 3 and 15

Solution:

Here two roots are 3 and 15

α = 3

β = 15

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

Sum of roots (α + β) = 3 + 15

                            = 18

Product of roots (α β) = 3(15)

                              = -45

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

x² - 18 x + (-45) = 0

x² - 18 x - 45 = 0


Question 9:

Construct a quadratic equation whose two roots are -10 and -3

Solution:

Here two roots are -10 and -3

α = -10

β = -3

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

Sum of roots (α + β) = -10 + (-3)

                            = -10 - 3   

                            = -13

Product of roots (α β) = -10(-3)

                              = 30

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

x² - (-13) x + 30 = 0

x² + 13 x + 30 = 0




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