Question 122988
testing some factors of -40 shows that -4 is a root __ this means that x+4 is a factor


dividing by x+4 __ (x^3+7x^2+2x-40)/(x+4)=x^2+3x-10


factoring __ x^2+3x-10=0 __ (x+5)(x-2)=0


so (x+4)(x+5)(x-2)=0 __ zeroes are -4, -5, 2


not synthetic division, but you can use the zeroes to divide "syntheticly"