Question

Find the rational roots of x^4 + 8x^3 + 7x^2 – 40x – 60 = 0

2, 6
–6, –2
–2, 6
–6, 2

Answer 1

substitute the given sets of points one by one and check which set satisfies the equation . That will give you the answer

Answer 2

so replace x with each first number?