KCET 2018 Math Solved Paper

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Question : 8 of 60
 
Marks: +1, -0
If|
−
a
×
−
b
|
2
+ |
−
a
·
−
b
|
2
= 144 and |
−
a
|
= 4, then the value of |
−
b
|
is
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