Question

Решите, пожалуйста! Очень надо!

Answer 1

$x + 4 = frac{20x + 7}{x} \ x(x + 4) = 20x + 7 \ x {}^{2} + 4x - 20x - 7 = 0 \ x {}^{2} - 16x - 7 = 0 \ d = ( - 16) {}^{2} + 4 times 7 = 256 + 28 = 284 = 2 sqrt{71} \ x _{1} = frac{16 - 2 sqrt{71} }{2} = 8 - sqrt{71} \ x_{2} = frac{16 + sqrt{71} }{2} = 8 + sqrt{71}$

Answer 2

упс, в Х2 двойку пропустил