factoriserA=5x^3-8x-xB=(4t-1)(2-t)+2-t-3(2-t)C= 3(x+1)(5x-4)-4+5xD=(3x+2)(2*1/4)-(3x+2)(5/2-x)E=3(x-4)+5x(x-4)-(x-4)(5x+1)F=(1-3x)(x+2)-(1-3x)^2