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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 7

The two adjacent sides of a rectangle are 2x2 – 5xy + 3z2 and 4xy – x2 – z2. Find the perimeter and the degree of the expression - Mathematics

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Question

The two adjacent sides of a rectangle are 2x2 – 5xy + 3z2 and 4xy – x2 – z2. Find the perimeter and the degree of the expression

Sum

Solution

Let the two adjacent sides of the rectangle as

l = 2x2 – 5xy + 3z2 and b = 4xy – x2y + 3z2 

Perimeter of the rectangle

= 2(l + b) = 2(2x2 – 5xy + 3z2 + 4xy – x2 – z2)

= 4x2 – 10xy + 6z2 + 8xy – 2x2 – 2z2

= 4x2 – 2x2 – 10xy + 8xy + 6z2 – 2z2

= x2(4 – 2) + xy(– 10 + 8) + z2(6 – 2z2)

Perimeter = 2x2 – 2xy + 4z2

Degree of the expression is 2.

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Degree of Expressions
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Chapter 3: Algebra - Exercise 3.4 [Page 63]

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Samacheer Kalvi Mathematics - Term 2 [English] Class 7 TN Board
Chapter 3 Algebra
Exercise 3.4 | Q 13 | Page 63
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