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Question

a) If xy=yx, then (xy)xy is equal to:

b) If xy=65 then x2+y2x2y2 is: [4 MARKS]

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Solution

Application: 2 Marks Each

a)xy=yx

x=yxy

(xy)xy=xxyyxy

=xxyx

=xxy1


b)xy=65

Let x=6k,y=5k

x2+y2x2y2=(6k)2+(5k)2(6k)2(5k)2

=61k211k2

=6111

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