(x+5)(x+2)(x-2); For this we can use factoring by grouping. Simply split the equation in 2 and factor out any terms. Then combine both the coefficients and the expression in parentheses (which should be the same.
x^3+5x^2 . -4x-20
x^2(x+5) . -4(x+5)
After combining the 2 expressions, we have a difference of squares (x^2-4) meaning a subtraction expression and both the terms in it are perfect squares. To factor, put the square root of both terms plus and minus each other in separate equations.