(x2 - 16) = (x + 4) (x - 4)
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Your equation is not clear I can understand it in two ways (x2-16)/x-4+x2=16 x=-4.59486 x=-0.793499 x=4.38835 or x2-(16/x)-4+x2=16 x=3.50466 x=-0.864641 x=-2.64002
A quadratic equation, if there's an equals stil to come... Otherwise it's just an expression.
It is a polynomial expression in x. What about it?
Infinity.
(x + 2)(x - 4)