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x(x+7)=450
x²+7x=450
x²+7x-450=0
(x+25)(x-18)=0
x+25=0 x-18=0
x= -25 x=18
supongo solo trabajas con los positivos,la respuesta seria x=18
x=18
x+7......18+7=25
los numero son 18 y 25