﻿ Add: 9xy - 3yz + 2zx; 2xz + 9xy - 4y and -2xz + 5x + 3xy. from Mathematics Algebraic Expressions and Identities Class 8 Manipur Board

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Add: 9xy - 3yz + 2zx; 2xz + 9xy - 4y and -2xz + 5x + 3xy.

We write the expressions in separate rows, keeping like terms in the same column:

9xy -3yz + 2zx
+  9xy        + 2zx - 4y
+ 3xy         - 2 zx + 5x
____________________________
21xy -3yz + 2zx -4y +5x

In the above example, -4y and 5x are carried over as they are, because they have no like terms. II. xz is same as zx.

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(a2 - b2)  is the product of:

• (a + b) ( a - b)

• (a + b) (a + b)

• (a - b) (a - b)

A.

(a + b) ( a - b)

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What is the mumerical co-effcient of  in -5xyz?

• -5

• 5

• -5xy

C.

-5xy

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What is the mumerical co-effcient of  x2y2?

• 0

• 1

• x2

B.

1

189 Views

What is the mumerical co-effcient of -3xy?

• 3

• -3

• -xy

B.

-3

126 Views

What kind of polynomial is pqr?

• monomial

• binomial

• trinomial

A.

monomial

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