Question

x^2-3.8x-5.8=0 решить уравнение СРОЧНО

Answer 1

${x}^{2} - 3.8x - 5.8 = 0 \\ {x}^{2} - 2 \times 1.9x + 3.61 - 3.61 - 5.8 = 0 \\ {(x - 1.9)}^{2} - 9.41 = 0 \\ (x - 1.9 - \sqrt{9.41} )(x - 1.9+ \sqrt{9.41} ) = 0 \\ x = 1.9 + - \sqrt{9.41}$