Page 20 - Mathematics Class - IX

Viva-Voce

1. What is a quadratic equation?
Ans. An equation with its highest exponent of variable as 2 or having degree 2 is called a quadratic equation.
2. Write the standard form of a quadratic equation.

Ans. ax + bx + c
2
3. What do you mean by a trinomial?
Ans. A polynomial having three terms is called a trinomial.
4. Define a polynomial.
Ans. A polynomial is an algebraic expression in the form of:

p(x) = a x + a x + a x + ... + a x + a , where a , a , a ... are constants and a ≠ 0.
n–1
n
n–2
n n–1 n–2 1 0 0 1 2 n
5. What is a zero polynomial?
Ans. The constant 0 is called the zero polynomial.
6. What is the expansion of (a + b + c) .
3
Ans. (a + b + c) = a + b + c + 3(a + b) (b + c) (c + a).
3
3

3
3

MCQs

1. The degree of the polynomial 2x – x + 3x + 5 is
3
4
a) 4 b) 1 c) –4 d) 3
2. a + 1/a is a polynomial of degree
a) 0 b) 1 c) 2 d) 3
3. Zero of the polynomial p(x) = 3x + 7 is
a) 7/3 b) − 3/7 c) − 7/3 d) 3/7
4. If a = 2 is a zero of the polynomial 2a + 3a – p, then p = ?
2
a) – 4 b) 14 c) 0 d) 8
5. If a + b + c = 0, then a + b + c is equal to
3
3
3
a) 3abc b) abc c) 2abc d) 0

Answers: 1. a) 4 2. c) 2 3. c) – 7/3 4. b) 14 5. a) 3abc

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