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

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) | Q 2.5 | Page 140

Evaluate :

abx − 15abx − 10abx + 32abx

Add : 5a + 3b, a − 2b, 3a + 5b

Add : 8x − 3y + 7z, −4x + 5y − 4z, −x − y − 2z

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

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

Subtract the sum of 5y² + y – 3 and y² – 3y + 7 from 6y² + y – 2.

How much more than 2x² + 4xy + 2y² is 5x² + 10xy – y² ?

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

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

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