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Posted by **Emmett** on Saturday, August 4, 2012 at 8:17pm.

4x4 + 15x2 − 4 = 0

- MATH -
**MathMate**, Saturday, August 4, 2012 at 11:35pmLet 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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