ACT 2010 December(69A) Math Question 17 Explanation - ACT Helper

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2010 December(69A) Math Question 17
Quadratic Equations
- FOIL
Choice D
$= 5 c (2 d - 5 c) - 3 d (2 d - 5 c)$ $= 10 c d - 36 c^{2} - 6 d^{2} + 15 c d$ $= 25 c d - 36 c^{2} - 6 d^{2}$
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