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(3p-6)² = 9p² - 36p + 36
(10k-3l)² = 100k² - 60kl + 9l²
(z+4)(z-4)=z² - 16
(3k+2)(3k-2) = 9k² - 4
(5m-3t)(5m+3t)=25m² - 9t²