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(a+b)^2= a^2+2ab+b^2
5^2=17+2ab
25-17=2ab
8=2ab
4=ab
(a-b)^2=a^2-2ab+b^2
(a-b)^2=17-2ab
(a-b)^2=17-2(4)
(a-b)^2=9
*a-b=3
*a-b=-3
pero como a>b la primera respuesta seria la correcta a-b=3