x1 = 3.75
x2 = -2
Объяснение:
5(х^2-9)-4x+6 = x^2-x+4x-4-5
5x^2-45-4x+6 = x^2+3x-9
4x^2-7x-30 = 0
D= 49 +480 = 529
x1 = -b+sqrt(D) / 2a = (7 +23)/8 = 3.75
x2 = -b-sqrt(D) / 2a = (7 -23)/8 = -2
x1 = 3.75
x2 = -2
Объяснение:
5(х^2-9)-4x+6 = x^2-x+4x-4-5
5x^2-45-4x+6 = x^2+3x-9
4x^2-7x-30 = 0
D= 49 +480 = 529
x1 = -b+sqrt(D) / 2a = (7 +23)/8 = 3.75
x2 = -b-sqrt(D) / 2a = (7 -23)/8 = -2