(K+4L)·(K-4L) - (K²+15L²) =
= K² - (4L)² - K² - 15L² =
= K² - 164L² - K² - 15L² = -31L²
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(K+4L)·(K-4L) - (K²+15L²) =
= K² - (4L)² - K² - 15L² =
= K² - 164L² - K² - 15L² = -31L²