5x^2+33x+40=5(x+5)(x-a)

5х2 + 33х + 40= 5( х2 + 5х-ах-5а);5х2+33х+40=5х2+25х-5ах-25а;33х+40-25х+5ах+25а=о;8х+40+5ах+25а=0;А(5х+25)=-8х-40;А= -8х-40/5х+25;А=-8(х+5)/5(х+5)А=-8/5А=-1,6