Question

x的五次加x减1如何因式分解?

Answer 1

=x^5+x^2-x^2+x-1

=X^2(x^3+1)-(X^2-x+1)

=x^2(x+1)(X^2-x+1)-(X^2-x+1)

=(X^2-x+1)(x^3+x^2-1)