Posted by Emmett on Saturday, August 4, 2012 at 8:17pm.
Let y=x²
the equation can then be written as
4y²+15y-4=0
Solve for y using the quadratic formula (i.e. find y1 and y2).
Since y=x², then
x=±√(y1) or ±√(y2)
giving a total of 4 solutions.
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