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= (3a - 10b)(3a - 10b)
= 9a² - 30ab - 30ab + 100b²
= 9a² - 60ab + 100b²
= (3a - 10b)(3a - 10b)
= 3a (3a - 10b) - 10b (3a - 10b)
= 9a^2 - 30ab - 30ab + 100b^2
= 9a^2 - 60ab + 100b^2