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) [Page 140]

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

Evaluate :

7x − 9y + 3 − 3x − 5y + 8

Add : a − 3b + 3; 2a + 5 − 3c; 6c − 15 + 6b

Subtract : 6a + 3 from a³ − 3a² + 4a + 1

Subtract : a²+ ab + b² from 4a² − 3ab + 2b²

Take away – 3x³ + 4x² – 5x+ 6 from 3x³ – 4x² + 5x – 6

Take m² + m + 4 from −m² + 3m + 6 and the result from m² + m + 1.

The perimeter of a triangle is 8y² – 9y + 4 and its two sides are 3y² – 5y and 4y² + 12. Find its third side.

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

How much smaller is 15x – 18y + 19z than 22x – 20y – 13z + 26 ?

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