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√((6x + 2)² - 4(9)(x²+1))/(2(9))I got√(12x - 16)/9 → √(4(3x - 4))/9But the book has√(6x - 8)/9 → √(2(3x -4))/9

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1. √((6x + 2)² - 4(9)(x²+1))/(2(9))

I got
√(12x - 16)/9 → √(4(3x - 4))/9
But the book has
√(6x - 8)/9 → √(2(3x -4))/9





 
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