-4
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x = { +6, -6 }
x = sq root of 36x = 6x = -6
The answer to the question depends on the set of numbers within which you are working. If you are working in integers, x2 = 2.25 has no solution. However, it does have a solution in rational numbers (x = 1.5). If working with rationals, x2 = 6 has no rational solution but it does have a solution in real numbers. Yet again, x2 = -6 has no solution in the reals, but does have a solution in complex numbers.
(x-6)(x+4) = 0 x = 6 or x = -4
x = 6 or x = -6 This is because a negative multiplied by a negative gives a positive.