Add : 13ab − 9cd − xy, 5xy, 15cd − 7ab, 6xy − 3cd - Mathematics

Add : 13ab − 9cd − xy, 5xy, 15cd − 7ab, 6xy − 3cd

Sum

(13ab − 9cd − xy) + (5xy) + (15cd - 7ab) + (6xy - 3cd)

= 13ab - 7ab - 9cd + 15cd - 3cd + (-xy + 5xy + 6xy)

= 6ab - 12cd + 15cd + 11xy - xy

= 6ab + 3cd + 10xy

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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 2.5 | Page 140

Evaluate :

b²y − 9b²y + 2b²y − 5b²y

Add : 5a + 3b, a − 2b, 3a + 5b

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

Subtract : −2x²y + 3xy²from 8x²y

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

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

How much less 2a² + 1 is than 3a² – 6 ?

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