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x in (-oo:+oo)
x*((x^2-224)/16) = 0
(x*(x^2-224))/16 = 0
( x )
x = 0
( x^2-224 )
1*x^2 = 224 // : 1
x^2 = 224
x^2 = 224 // ^ 1/2
abs(x) = 4*14^(1/2)
x = 4*14^(1/2) or x = -(4*14^(1/2))
x in { 0, 4*14^(1/2), -(4*14^(1/2)) }
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