Question

5.2²+{X +3}=5

Answer 1

5.4+(X+3)=5

20+(X+3) =3

    X+3    = -17

  =>  X    = -20

Answer 2

5.2²+{X +3}=5

2² + { x + 3 } = 5 . 5 

4 + { x + 3 } = 25

x + 3 = 25 - 4

x + 3 = 21

x = 21 - 3

x = 18