Выделите полный квадрат:80x+84-16x^2
-(16x^2 - 80x - 84)
16x^2 = (4x)^2
80x = 2 * 4x * 10 => второе слагаемое = 10, его квадрат = 100
-(16x^2 - 80x - 84) = -((4x)^2 -2*4x*10 +100 -100 -84) = -(4x-10)^2 +184
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-(16x^2 - 80x - 84)
16x^2 = (4x)^2
80x = 2 * 4x * 10 => второе слагаемое = 10, его квадрат = 100
-(16x^2 - 80x - 84) = -((4x)^2 -2*4x*10 +100 -100 -84) = -(4x-10)^2 +184