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Area = (x + 3)*(x + 10) = 120x^2 + 13x - 90 = 0

(x + 18)*(x - 5) = 0

Therefore x = -18 or x = 5.

x = -18 gives sides of negative length and so is not a possible solution.

Therefore x = 5 => A = 8 and B = 15

Then Diagonal = sqrt(8^2 + 15^2) = sqrt(64 + 225) = sqrt(289) = 17 metres.

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