book Maths Puzzle Numerical Ability

What would you do to simplify a quadratic expression such as 5x^3-27x^2+58x+56?

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book Other Question

1990 population 23,365
1995 population 24,226
2000 population 24,226

a. the percent increase from 1990 to 1995.
b. the percent increase from 1995 to 2000.
c. the percent increase from 1990 to 2000.
I NEED HELP WITH FACTORING THIS:
18C^4 - 9C^2 + 7C