Q. Rewrite the expression as a product of four linear factors:(x2−5x)2−2(x2−5x)−24Answer:
Identify Expression: Let's identify the expression we need to factor: (x2−5x)2−2(x2−5x)−24. To simplify the factoring process, let's use a substitution where u=x2−5x. This will allow us to rewrite the expression in terms of u, which will look like a quadratic equation.Substitute u for (x2−5x): u2−2u−24.
Substitute and Simplify: Now we have a quadratic equation in terms of u: u2−2u−24. We need to factor this quadratic equation.To factor u2−2u−24, we look for two numbers that multiply to −24 and add up to −2. These numbers are −6 and +4.So, we can write u2−2u−24 as (u−6)(u+4).
Factor Quadratic Equation: Now that we have factored the quadratic in terms of u, we need to substitute back x2−5x for u to get the expression in terms of x. Substitute back: (u−6)(u+4) becomes ((x2−5x)−6)((x2−5x)+4).
Substitute Back: We now have two quadratic factors: ((x2−5x)−6) and ((x2−5x)+4). Each of these can be factored further into linear factors.First, let's factor (x2−5x−6). We look for two numbers that multiply to −6 and add up to −5. These numbers are −6 and +1.So, we can write x2−5x−6 as (x−6)(x+1).
Factor Quadratic Factors: Next, we factor (x2−5x+4). We look for two numbers that multiply to 4 and add up to −5. These numbers are −4 and −1. So, we can write x2−5x+4 as (x−4)(x−1).
Factor Linear Factors: Now we have all four linear factors: (x−6), (x+1), (x−4), and (x−1). The original expression (x2−5x)2−2(x2−5x)−24 can be rewritten as the product of these four linear factors. The final expression is: (x−6)(x+1)(x−4)(x−1).
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