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Assume this quadratic equation equals zero. Then :-
x2 - 13x + 40 = 0, this can be factored (x - 8)(x - 5) = 0
This holds true when either x - 8 = 0 or x - 5 = 0
When x - 8 = 0 then x = 8 : When x - 5 = 0 then x = 5
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