exam Maths Puzzle Numerical Ability

(a+bi)^2=2i
then what are the possible values of a and b?

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I need help with 3a/a+1 + 4/a-2 =3 From Abu Dhabi to Al-Ain is 149 km. A cyclist starts from Abu Dhabi cycling to Al-Ain at a steady speed of 14 km/hr. An hour later, a car starts from Al-Ain going to Abu Dhabi at a steady speed of 4o km/hr. How far from Abu Dhabi do they meet?