Question 479678
the three sides of the right triangle are 
x, x+1, x+9

x^2+(x+1)^2=(x+9)^2

x^2+x^2+2x+1 = x^2+18x+81

x^2-16x-80=0

x^2-20x+4x-80=0

x(x-20)+4(x-20)=0
(x-20)(x+4)=0

x=20 which is positive
20 21,& 29 are the sides

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