## 10th Maths Book Back Question and Answers – Chapter 3 Exercise 3.10:

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### Samacheer Kalvi 10th Maths Book Back Answers – Ex 3.10 Algebra

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#### Exercise 3.10 Algebra

1. Solve the following quadratic equations by factorization method
(i) 4x2 – 7x – 2 = 0
(ii) 3(p2 – 6) = p(p + 5)
(iii) a(a−7)−−−−−−−√=32–√
(iv) 2–√x2+7x+52–√=0
(v) 2x2 – x + 18 = 0
Solution:

(ii) 3(p2 – 6) = p(p + 5)
3p2 – 18 = p2 + 5p ⇒ 392 – 5p – 18 = 0
⇒ 2p2 – 5p – 18 = 0
⇒ (2p – 9) (p + 2) = 0 ⇒ p = 92, -2

(iii) a(a−7)−−−−−−−√=32–√
Squaring on both sides
a(a – 7) = 9 × 2
a2 – 7a – 18 = 0
a2 – 9a + 2a – 18 = 0
a(a – 9) + 2(a – 9) = 0
(a – 9) (a + 2) = 0
⇒ a = 9, a = -2

(v) 2x2 – x + 18 = 0
16x2 – 8x + 1 = 0
16x2 – 4x – 4x + 1 = 0
4x(4x – 1) – 1(4x – 1) = 0
(4x – 1) (4x – 1) = 0
⇒ x = 14,14

2. The number of volleyball games that must be scheduled in a league with n teams is given by G(n) = n2−n2 where each team plays with every other team exactly once. A league schedules 15 games. How many teams are in the league?
Answer:
Number of games = 15
G(n) = n2−n2
n2−n2 = 15
n2 – n = 30 ⇒ n2 – n – 30 = 0
⇒ n2– 6n – 5n – 30 = 0
(n – 6) (n + 5) = 0
n – 6 = 0 or n + 5 = 0
[Note: – 5 is neglected because number of team is not negative]
n = 6 or n = -5
∴ Number of teams = 6

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