Find the Total Savings of a Boy Who Saves ₹ (4x – 6y); ₹ (6x + 2y); ₹ (4y – X) and ₹ (Y – 2x) for Four Consecutive Weeks.

Find the total savings of a boy who saves ₹ (4x – 6y), ₹ (6x + 2y), ₹ (4y – x) and ₹ (y – 2x) for four consecutive weeks.

Sum

4x − 6y
6x + 2y
–x + 4y
–2x + y
7x + y

∴ Total saving = ₹(7x + y)

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Combining like Terms

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Chapter 11 Algebraic Expressions
Exercise 11 (B) | Q 3 | Page 140

Evaluate :

abx − 15abx − 10abx + 32abx

Evaluate :

7x − 9y + 3 − 3x − 5y + 8

Add : 5a + 3b, a − 2b, 3a + 5b

Subtract : 3a − 5b + c + 2d from 7a − 3b + c − 2d

Subtract : cab − 4cad − cbd from 3abc + 5bcd − cda

What must be added to x⁴ – x³ + x² + x + 3 to obtain x⁴ + x² – 1 ?

If x = 6a + 8b + 9c ; y = 2b – 3a – 6c and z = c – b + 3a ; find :

The sides of a triangle are x² – 3xy + 8, 4x² + 5xy – 3 and 6 – 3x² + 4xy. Find its perimeter.

What must be subtracted from 19x⁴ + 2x³ + 30x – 37 to get 8x⁴ + 22x³ – 7x – 60 ?

How much bigger is 5x²y² – 18xy² – 10x²y than –5x² + 6x²y – 7xy?