X2 + 10X - 11 = 0
What two factors of - 11 add up to 10 ?
(X - 1)(X + 11)
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X = 1
X = - 11
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x = -½
Using the discriminant of b^2 -4ac = 0 the value of k works out as -2
That factors to (x - 2)(x + 7)
It can not be factored because its discriminant is less than zero
That factors to (x - 2)(x + 4) x = 2, -4