Question

1) 9$x^{2}$+6x-8=0

Answer 1

9х^2 + 6х - 8 = 0

a = 9 b = 6 c = -8

D = b^2 - 4*a*c = 6^2 - 4*9*(-8) = 36 + 288 = 324 = 18^2

x1 = (-b + ✓D)/2*a = (-6 + 18)/2*9 = 12/18 = 2/3

x2 = (-b - ✓D)/2*a = (-6 - 18)/2*9 = -24/18 = -4/3 = -1 1/3

Ответ: х1 = 2/3; х2 = -1 1/3