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MEAP Preparation - Grade 7 Mathematics
2.56 Addition of Binomials - I

Horizontal Method

In this method, the expressions to be added are summed first. Then like terms in the expressions are written together using Associative Law for addition.

Example: Add the expressions (3a2+2b), (7a-4b) and (a2-6a).
Solution:
Summing the expressions, we have,
(3a2+2b)+(7a-4b)+(a2-6a)

Writing the like-terms together using Associative Law,
(3a2+a2)+(2b-4b)+(7a-6a)
=(3a2+a2)+[2b+(-4)b]+[7a+(-6)a]
=(3+1)a2+[2+(-4)]b+[7+(-6)]a
=4a2+(-2)b+a .......(Adding like terms)
=4a2-2b+a.


Directions: Add the binomials given below. Also write at least 10 examples of your own.
Q 1: Add (k+l) and (k-l).
2k
1
0
2k+2l

Q 2: Add (2m+n) and (3n-m).
4m+4n
3m+4n
m+4n
2m-2n

Q 3: Add (8p-9q) and (5q+6p).
15p+15q
14p+14q
14p-4q
13p-3q

Q 4: Add (5a+4b) and (-3a+2b).
4x+2y
2a+6b
8a+6b
14ab

Q 5: Add (-3c-4d) and (8c-6d).
11c-10d
5c-10d
-9c+4d
11c+2d

Q 6: Add (3x+4y) and (x-2y).
3x2+2y2
4x+2y
2a+6b

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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