Question

4x(3x-1)-3(2x+3)=42
помогите решить уравнение!!

Answer 1

12x^2 - 4x - 6x - 9 = 42
12x^2 - 10x - 51 = 0 
D = 100 + 4*12*51 = 2548 
√D = √(196*13) = 14√13

x₁ = ( 10 + 14√13)/24 = 5/12 + (7√13)/12
x₂ = ( 10 - 14√13)/24 = 5/12 - (7√13)/12