54² - (-6²) + (-7²) + 8²
= (54² + 6²) - 7² + 8²
= (54 + 6)² - 2(54)(6)) - 49 + 64
= 60² - 648 + 15
= 3.600 - 648 + 15
= 2.952 + 15
= 2.967
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54² - (-6²) + (-7²) + 8²
= (54² + 6²) - 7² + 8²
= (54 + 6)² - 2(54)(6)) - 49 + 64
= 60² - 648 + 15
= 3.600 - 648 + 15
= 2.952 + 15
= 2.967