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18 = 6x + x^2 - 13x
18 = x^2 - 7x
0= x^2 -7x -18
0= (x -9) (x+2)
x=9 x=-2
2)
x^2 + (x+2)^2 = 580
x^2 + x^2 + 4x + 4 = 580
2x^2 + 4x - 576=0
(2x +36 )( x -16 )
x= - 18, x= 16
Si te sirvió, dale a mejor respuesta. c: