A) \[4\]
B) \[5\]
C) \[6\]
D) \[\pm \,5\]
Correct Answer: D
Solution :
(d): \[|y{{|}^{2}}-|y|-20=0\] \[(|y|-5)(|y|+4)=0\] \[|y|=5\]or \[-4\] But\[|y|\]must be non - negative. \[\therefore |y|=5,\]i.e., \[y=\pm 5\]You need to login to perform this action.
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