Page 74 - Maths Skills - 8

Algebraic E
5 5 Algebraic Expressions xpressions
and IdentitiesIdentities
and

Learning Outcomes

In this chapter, you will learn about:
� Terms in algebra � Multiplication of algebraic expressions
� Addition and subtraction of algebraic expressions � Standard identities

Boot-Up (To Recapitulate Previous Knowledge of Concepts)

COMPETENCY BASED QUESTIONS

A. Multiple-Choice Questions
1. In the algebraic expression 4xz – 3x + 5z + 8, the constant term is
(i) 4xz (ii) – 3x (iii) 5z (iv) 8
2. What is the coefficient of x in 12xy – 23y?

(i) 12 (ii) y (iii) 12y (iv) – 23y
3. Cross the odd one out in the following.

(i) 11x (ii) – 29x (iii) – 5y (iv) 55x

B. Fill in the Blanks
1. The value of a ________________ is not fixed as it can take various values.

2. In the expression 3yz + 5, 3, y and z are the ________________ of the term 3yz.
3. An expression which contains ________________ terms is called a trinomial.

4. If x = – 2, the value of the expression, x + 2 is _____________.

C. Write ‘T’ for true and ‘F’ for false Statements
1. If we denote the length of a rectangle by l and its breadth by b, then the area of the rectangle is l × b.

2. x + 1 is a monomial.

3. The sum of 4x + 9 and – 3x – 2 is x + 7.

4. The sum of 2xy and 3x is 5xy.