Page 26 - Mathematics Class - IX

Viva-Voce

1. Find the value of (2a – y) .
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Ans. (2a – y) = 8a – 12a y + 6ay – y 3
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3
3
2
2. Write a – b in terms of (a – b) .
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3
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Ans. a – b = (a – b) + 3a b – 3ab 2
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3
3
2
3. A cubic polynomial and a trinomial are same? True or False.
Ans. False.
4. Is a zero of a polynomial always zero?
Ans. No.
5. If x – 3x + 3x – 1 is divided by x, what will be the remainder?
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2
Ans. –1
6. What is the condition for (a – b) = +ve?
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Ans. Let (a – b) = +ve
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then a – b = +ve
or a > b
if a > b, then (a – b) = +ve
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7. What will be the value of p if (p–q) = 27q ?
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Ans.  (p – q) = 27 q 3
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or p – q = 3q
or p = 4q

MCQs

1. If x + 3x + 3x + 1 is divided by x + 1, then remainder is
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2
a) 2 b) 1 c) 3 d) 0
2. The value of (2 – a) + (2 – b) + (2 – c) – 3(2 – a)(2 – b)(2 – c) when a + b + c = 6 is
3
3
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a) –3 b) 3 c) 0 d) –1
3. Factorization of a + 1 is
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a) (a + 1) (a – a + 1) b) (a + 1) (a + 1) c) (a + 1)(a + a + 1) d) (a – 1)(a – a – 1)
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2
2
2
4. The degree of x + 3x – 7x is
4
5
a) 4 b) 5 c) 3 d) 1
5. The value 10 – 300 + 30 – 1 3
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a) 792 b) 279 c) 729 d) 972
Answers: 1. d) 0 2. c) 0 3. a) (a + 1)(a – a + 1)
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4. b) 5 5. c) 729

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