№822
а) 5(3а+7)²
б) -6(4-b)²
в) -3(2-x)² -10x
г) 12a² - 4(1-2a)² +8
а) 5(3а+7)²
б) -6(4-b)²
в) -3(2-x)² -10x
г) 12a² - 4(1-2a)² +8
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Answers & Comments
б) -6(4-b)²=-6(16-8b+b^2)=-96+48b-6b^2
в) -3(2-x)² -10x=-3(4-4x+x^2)-10x=-12+12x-3x^2-10x=-12+2x-3x^2
г) 12a² - 4(1-2a)² +8=12a^2-4