root are given To form the quadratic equaction The required equation
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Answers
Explanation:
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Answer:
Formula (i) is used for the formation of a quadratic equation when its roots are given.
For example suppose we are to form the quadratic equation whose roots are 5 and (-2). By formula (i) we get the required equation as
x2 - [5 + (-2)]x + 5 ∙ (-2) = 0
⇒ x2 - [3]x + (-10) = 0
⇒ x2 - 3x - 10 = 0
Solved examples to form the quadratic equation whose roots are given:
1. Form an equation whose roots are 2, and - 12.
Solution:
The given roots are 2 and -12.
Therefore, sum of the roots, S = 2 + (-12) = 32
And tghe product of the given roots, P = 2 ∙ -12 = - 1.
Therefore, the required equation is x2 – Sx + p
i.e., x2 - (sum of the roots)x + product of the roots = 0
i.e., x2 - 32x – 1 = 0
i.e, 2x2 - 3x - 2 = 0