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Juan = x² +36
Jordan = x
Dentro de 3 años:
Juan = x² +36 +3
Jordan = x +3
Para plantear una ecuación debemos igualar las edades:
x² +36 +3 = (x +3)²
x² +39 = (x)² +2(3x) +(3)²
x² +39 = x² +6x +9
39 -9 = x² -x² +6x
30 = 6x
30/6 = x
5 = x
x = 5
Juan = x² +36 = 5² +36 = 25 +36 = 61
Juan tiene 61 años opcion d) 61