what are 2 numbers whose product is -13 but whose sum is 12

Answer 1

xy=-13

x+y=12 -> x=12-y

xy = (12-y)y = -13 -> 12y-y^2=-13 -> y^2-12y-13 = 0

(y-13)(y+1) = 0

y=13

x=-1

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