Question

show that (x + 4), (x - 3) and (x- 7) are factors of x³-6x²-19x+84

Answer 1

this may help you out

Answer 2

(x + 4)=0

(x - 3)=0

(x- 7)=0

put x=-4,3 & 7

if it's zero then... (x + 4), (x - 3) and (x- 7) r .....