Question

(6c - 5)(6c +5)-(6c -5) в квадра
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Answer 1

= 36c² - 25 - ( 36c² - 60c + 25 ) = 36c² - 25 - 36c² + 60c - 25 = 60c - 50

Answer 2

$(a-b)(a+b)=a^2-b^2\ (a-b)^2=a^2-2ab+b^2\ 36c^2-25-36c^2+60c-25=60c-50$