book Maths Puzzle Numerical Ability

Complete the follow equation. Your answers will be algebraic expressions. (a+bi)^2= ??? + ??? i

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i have 50-rs
spent balance
20- 30-
15- 15-
9- 6-
6- 0-
............. ..............
50- 51-
where dis that one rupee comes from
Hi Tutors, it's me again I need help with the following problems can you help me. Thank you so much.

y=3x+2

x=5x

y=2x+1