Question

Find the rational roots of x4 +8x3 +7x2 −40x−60 = 0

Answer 1

Try to factor x4 +8x3 +7x2 −40x−60

Answer 2

Factor theorem may help.

Answer 3

well,,you need to find only rational roots..rational root theorem is what you are looking for..

Answer 4

x^4 +8*x^3 +7*x^2 -40*x -60 = 0 =>
=> x^4 +8*x^3 +7*x^2 -40*x -60 = 0
=> (x +6)*(x +2.236)*(x +2)*(x -2.236) = 0

Real solutions:
Root 1: -6
Root 2: -2.236
Root 3: -2
Root 4: 2.236