Question

9-х^2>3х решите уравнение

Answer 1

скажи, а какой знак после х?

Answer 2

х в степени 2

Answer 3

$9-x^2 > 3x\- x^2 - 3x + 9 > 0\x^2 + 3x - 9 < 0\D = b^2 - 4ac = 3^2 + 4*9 = 9 + 36 = 45. D > 0.\x_{1} = frac{-3 + sqrt{45}} {2} = frac{-3 + 3sqrt{5}} {2}  = frac{3} {2}(sqrt{5}-1)\x_{2} = frac{-3 - sqrt{45}} {2} = frac{-3 - 3sqrt{5}} {2} = -frac{3} {2}(sqrt{5}+1)\-frac{3} {2}(sqrt{5}+1) < x < frac{3} {2}(sqrt{5}-1)$