I attempted this problem but got it incorrect. If someone could guide me step by step on how to do this problem it would be greatly appreciated.
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Originally Posted by DasRabbit I attempted this problem but got it incorrect. If someone could guide me step by step on how to do this problem it would be greatly appreciated. This is the product of special binomials. You can just use the distributive law or the fact that $\displaystyle (a-b)(a+b)=a^2-b^2$ In your case $\displaystyle a=4x \quad b = 5\sqrt{6}$
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