Test: Algebraic Expressions And Identities- 1


10 Questions MCQ Test Mathematics (Maths) Class 8 | Test: Algebraic Expressions And Identities- 1


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This mock test of Test: Algebraic Expressions And Identities- 1 for Class 8 helps you for every Class 8 entrance exam. This contains 10 Multiple Choice Questions for Class 8 Test: Algebraic Expressions And Identities- 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Algebraic Expressions And Identities- 1 quiz give you a good mix of easy questions and tough questions. Class 8 students definitely take this Test: Algebraic Expressions And Identities- 1 exercise for a better result in the exam. You can find other Test: Algebraic Expressions And Identities- 1 extra questions, long questions & short questions for Class 8 on EduRev as well by searching above.
QUESTION: 1

Which of the following is an expression?

Solution:

An algebraic expression include constants, variables and coefficients, so answer is 4x+7

QUESTION: 2

Which of the following is a binomial?

Solution:

A polynomial equation with two terms usually joined by a plus or minus sign is called a binomial. Binomials are used in algebra.

For option a) there are three terms in the expression i.e. 7, 3x and 4

For option c) there are three terms as well i.e. 4x, y and 2.

For option d) there is only one term i.e. 3x

For option b) there are two terms i.e 2x and 7. Therefore it is a binomial.

Notice Bi means 2 so a binomial has 2 terms.

QUESTION: 3

Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y, –3xz + 5x – 2xy.

Solution:

Writing the three expressions in separate rows, with like terms one below the other, we have

7xy + 5yz    – 3zx

+        4yz   + 9zx        – 4y

+ –2xy        – 3zx  + 5x         

-----------------------------------------

= 5xy + 9yz + 3zx  + 5x – 4y

 

Thus, the sum of the expressions is 5xy + 9yz + 3zx + 5x – 4y. Note how the terms, – 4y

in the second expression and 5x in the third expression, are carried over as they are, since

they have no like terms in the other expressions.

QUESTION: 4

Expression that contains only one term is called a __________.

Solution:
QUESTION: 5

Simplify: (xy + yz)2− (xy − yz)2

Solution:
QUESTION: 6

Simplify(xy + yz)2− 2x2y2z. Find the value when x = -1, y = 1 and z = 2.

Solution:
QUESTION: 7

Using identity (x - a) (x + a) = x2 - a2 find 5− 42.

Solution:
QUESTION: 8

Using identity (x − a) (x + a) = x− a2 find 6− 52

Solution:

To find: 62 - 52:

Putting x = 6 and a = 5 in identity x2 - a2 = (x - a)(x+a);

⇒ 62- 52 = (6 - 5)(6 + 5) = 11.

QUESTION: 9

Terms are added to form ___________.

Solution:

Terms include variables,constants and coefficients which when added forms an expression.

QUESTION: 10

Which of the following is like term as 7xy?

Solution: 9xy is the like term of 7xy as ...9xy and 7xy contains the same variable (xy).. if we have to find like terms then.. we we should see that they both contains same variable ..numbers doesn't matter ..they can be sake itlr different.. therefore 9xy is the like term of 7xy and visa versa..