$$\\-3=2x^2-5x\\ 0=2x^2-5x+3\\ $multiply to 6, add to -5 numbers are -2 and -3$\\ $change -5x into -2x-3x$\\ 0=2x^2-2x-3x+3\\ 0=2x(x-1)-3(x-1)\\ 0=(2x-3)(x-1)\\ 2x-3=0 \qquad or \qquad x-1=0\\ x=3/2\qquad \quad or \qquad x=1\\$$
$$\\-3=2x^2-5x\\ 0=2x^2-5x+3\\ $multiply to 6, add to -5 numbers are -2 and -3$\\ $change -5x into -2x-3x$\\ 0=2x^2-2x-3x+3\\ 0=2x(x-1)-3(x-1)\\ 0=(2x-3)(x-1)\\ 2x-3=0 \qquad or \qquad x-1=0\\ x=3/2\qquad \quad or \qquad x=1\\$$