Posted by julez on Saturday, October 29, 2011 at 7:07pm.
let z = x^2
then
z^2 + 3 z - 4 = 0
(z-4)(z+1) = 0
z = 4 or z = 1
so
x^2 = 4 or x^2 = 1
so
+/- 2 and +/- 1
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