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**SillyBilly** Hello, i have some problem with these two polynomial questions.

1.

The polynomial 6x^{3} + mx^{2} + nx - 5 has a factor of x+1. When divided by x-1, the remainder is 4. What are the values of m and n?

I am lost completely on this one..

2.

Hyun has designed a rectangular building. His scale model is 1m x 2m x 4m. In order to maintain the scale he needs to increase each dimension by the same amount. By what amount should he increase each dimension to make a building that is no more than 9 times the volume of his scale model? Give a full algebraic solution.

For this one i have found the amount that needs to be increased (2m for each dimension) and have figured out that it is a quartic function from the 4th differences, as well as the y intercept being 8 but i do not know what to do from here.

Any help is appreciated thank youu!!!!