In a word, you don't. This quadratic trinomial does not factor over the integers. How do I know? Square the coefficient on the first degree term -- 5 squared is 25. Multiply -4 times the coefficient on the high order term times the constant, -4 times 2 times -6 is 48. Combine that with the previous result, 25 plus 48 = 73. 73 is NOT a perfect square, so the polynomial doesn't factor over the integers.
