Question

factorisation of x^4+5x^3-5x-6​

Answer 1

Explanation:

If you have a polynomial with integer coefficients you can try to find the solutions applying the Rational Zeros Theorem.

This theorem says that if a root is rational, it has to have the numerator as one of the factors of the constant and the denominator as one of the factors of the coefficient of the leading term.

It is easier to see in your case.