i need help, sleps plzz , i dont understand plzzz dont ignoree!!!!!!!!!!!!

Answer:
x = [tex]\frac{3+\sqrt{105} }{8} , \frac{3-\sqrt{105} }{8} x=1.655,-0.905[/tex]
Step-by-step explanation:
3x+6 = 4x^2
4x^2 -3x -6 = 0
x = [tex]\frac{3+\sqrt{105} }{8} , \frac{3-\sqrt{105} }{8} x=1.655,-0.905[/tex]