91Ó°ÊÓ

1. The product of two factors with like signs is positive, and the product of two factors with unlike signs is negative.
2. If x is a variable and m, n are positive integers, then$x^{m+n}=(x^m×x^n)$

Factoring an algebraic expression means writing the expression as a product of factors.

To verify whether the factors are correct or not, multiply them and check if the result is the original algebraic expression.

Algebraic expressions can be factorized using the common factor method, regrouping like terms together, and also by using algebraic identities.

Factorizing the given trinomial by splitting the middle term:

$\begin{array}{c}{x}^2−8x+15=x^2−5x−3x+15\\ =x(x−5)−3(x−5)\\ =(x−3)(x−5)\end{array}$

Therefore, the factor of the given trinomial is $(x−3)(x−5)$.