4х² - 8х - 85 = 0, t = 3
х₁+х₂=8:4=2
х₁*х₂=85:4=-21,25
3*(-21,25)/2=-63,75:2=-31,875
4x² - 8x - 85 = 0
По теореме Виета:
x1 + x2 = - b/a = -(-8)/4 = 2
x1*x2 = c/a = -85/4
3*(-85/4) : 2 = -255/8
4х² - 8х - 85 = 0, t = 3
х₁+х₂=8:4=2
х₁*х₂=85:4=-21,25
3*(-21,25)/2=-63,75:2=-31,875
4x² - 8x - 85 = 0
По теореме Виета:
x1 + x2 = - b/a = -(-8)/4 = 2
x1*x2 = c/a = -85/4
3*(-85/4) : 2 = -255/8