If $$\sqrt {\left( {x - 1} \right)\left( {y + 2} \right)} = 7,$$ x and y being positive whole numbers, then the values of x and y respectively are ?
A. 8, 5
B. 15, 12
C. 22, 19
D. None of these
Answer: Option A
Solution(By Examveda Team)
$$\eqalign{ & \Leftrightarrow \sqrt {\left( {x - 1} \right)\left( {y + 2} \right)} = 7 \cr & \Leftrightarrow \left( {x - 1} \right)\left( {y + 2} \right) = {\left( 7 \right)^2} \cr & \Leftrightarrow \left( {x - 1} \right) = 7{\text{ and}}\left( {y + 2} \right) = 7 \cr & \Leftrightarrow x = 8{\text{ and }}y = 5 \cr} $$Related Questions on Square Root and Cube Root
The least perfect square, which is divisible by each of 21, 36 and 66 is:
A. 213444
B. 214344
C. 214434
D. 231444
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