21.
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If 3(x-y)= 27 and 3(x+y)=243, then x is equal to
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A. 0
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B. 2
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C. 4
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D. 6
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Answer:option:C
3(x - y)
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= 27
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= 33
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x - y = 3. ......(1)
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3(x+y)
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= 243
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= 35
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x + y = 5. .......(2)
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On solving equations 1 and 2, we get
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= x=4.
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Title : Surds And Indices Q21
Description : 21. If 3 ( x-y ) = 27 and 3( x+y )=243, then x is equal to A. 0 B. 2 C. 4 D. 6 Answer:option:C 3 ( x - y ) ...
Rating : 5
