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If you know about the difference of two squares then you can write the answer immediately as
(4c)² - (6)²
= 16c² - 36 answer
or you multiply out in full:
(4c + 6) (4c -6)
= 4c (4c -6) + 6 (4c -6) using distributive property
= 16c² - 24c + 24c - 36
= 16c² - 36
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