If | a b |^2+( a b )^2=144 and | a |=4 , then | b |=

Step-by-step solution

aligned & | a b |^2+( a b )^2=144 and | a |=4 & (| a |^2 | b |^2 ^2 )+ (| a |^2| b |^2 ^2 )=144 & | a |^2| b |^2 ( ^2 + ^2 )=144 & (4)^2| b |^2=144 | b |^2=9 | b |=3 aligned