ACT 2009 June(67C) Math Question 9 Explanation - ACT Helper

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2009 June(67C) Math Question 9
Quadratic Equations
- FOIL
Choice A
$= (3 x) (3 x + 4 y^{2}) - (4 y^{2}) (3 x + 4 y^{2})$ $= (9 x^{2}) + (12 x y^{2}) - (12 x y^{2}) - (16 y^{4})$ $= 9 x^{2} - (16 y^{4})$
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