x^4 - 27x^3 + 243x^2 - 759x=0; 9 is a root

Question

You are given a polynomial equation and one root. Check that the given number (9, in this case) is really a root, then solve the equation.

Answer 1

desmos.com/calculator/l95tbaahth

The video answer mentions that the problem was posted incorrectly. The final term of the function should be -729x.

Answer 2

Use Synthetic Substitute to verify the root.