If you mean 5x^2 -125 then it is 5(x^2 -25) when factored
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5x2
(5x-6)(x-3)
(5x - 1)(x + 6)
In mathematics, a numerical coefficient is a constant factor in a term of an algebraic expression. For example, in the term 5x, the numerical coefficient is 5. In the expression 2y^2, the numerical coefficient is 2. Numerical coefficients can be positive, negative, integers, fractions, or even irrational numbers.
To factor any term, divide by the LCF (largest common factor) of the term. For 5x2-45, the LCF is 5. 5x2-45 = 5(x2-9) It can, of course, be factored even further to become: 5(x2-9) = 45(x2/9 - 1) but when factoring, we usually don't need to go past 5(x2-9) (for example, you've figured out that x2 = 9, thus x = +/- 3.)