10th Maths Book Back Question and Answers – Chapter 3 Exercise 3.9:
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Samacheer Kalvi 10th Maths Book Back Answers – Ex 3.9 Algebra
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Chapter 3
Exercise 3.9 Algebra
1. Determine the quadratic equations, whose sum and product of roots are
(i) -9, 20
(ii) 53, 4
(iii) −32, -1
(iv) -(2 – a)2, (a + 5)2
Solution:
If the roots are given, general form of the quadratic equation is x2 – (sum of the roots) x + product of the roots = 0.
(i) Sum of the roots = -9
Product of the roots = 20
The equation = x2 – (-9x) + 20 = 0
⇒ x2 + 9x + 20 = 0
(ii) Sum of the roots = 53
Product of the roots = 4
Required equation = x2 – (sum of the roots)x + product of the roots
= 0
⇒ x2 – 53x + 4 = 0
⇒ 3x2 – 5x + 12 = 0
(iii) Sum of the roots = (−32)
(α + β) = −32
Product of the roots (αβ) = (-1)
Required equation = x2 – (α + β)x + αβ = 0
x2 – (−32)x – 1 = 0
2x2 + 3x – 2 = 0
(iv) α + β = – (2 – a)2
αβ = (a + 5)2
Required equation = x2 – (α + β)x – αβ = 0
⇒ x2 – (-(2 – a)2)x + (a + 5)2 = 0
⇒ x2 + (2 – a)2x + (a + 5)2 = 0
2. Find the sum and product of the roots for each of the following quadratic equations
(i) x2 + 3x – 28 = 0
(ii) x2 + 3x = 0
(iii) 3 + 1a=10a2
(iv) 3y2 – y – 4 = 0
(i) x2 + 3x – 28 = 0
Answer:
Sum of the roots (α + β) = -3
Product of the roots (α β) = -28
(ii) x2 + 3x = 0
Answer:
Sum of the roots (α + β) = -3
Product of the roots (α β) = 0
(iii) 3 + 1a=10a2
3a2 + a = 10
3a2 + a – 10 = 0 comparing this with x2 – (α + β)
x + αβ = 0
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