Question

решите уравнение (3x-2)(4x+1)-x(2-3x)=0

Answer 1

Объяснение:

12x^2 + 3x -8x -2 - 2x + 3x^2 =0

15x^2 -7x - 2 =0

d= (-7)^2 -4 ×15 × (-2) = 49 + 120 = 169

x1 = 7 +13/30 = 20 / 30 = 2/3

x2 = 7 -13 /30 = - 6 / 30 = 3 / 15 = 1 / 5 = 0, 2