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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
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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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