36c² - 48cy + k = (6c)² - 2 * 6c * 4y + (4y)² = 36c² - 48cy + 16y² =
= (6c - 4y)²
k =16y²
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36c² - 48cy + k = (6c)² - 2 * 6c * 4y + (4y)² = 36c² - 48cy + 16y² =
= (6c - 4y)²
k =16y²