That factors to (x - 2)(x + 4)
x = 2, -4
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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
9x squared plus 16 = 0 factored is plus and minus 4/3 i.