Q. Rewrite the expression as a product of four linear factors:(x2+x)2−22(x2+x)+40Answer:
Identify Expression: Let's first identify the expression we need to factor:The expression given is (x2+x)2−22(x2+x)+40.Notice that this is a quadratic in form, where (x2+x) is like a single variable. Let's substitute u for (x2+x) to make it easier to see the quadratic form.So, we have u2−22u+40.
Substitute Variable: Now, we need to factor the quadratic expression u2−22u+40. We are looking for two numbers that multiply to 40 and add up to −22. These numbers are −20 and −2. So, we can write u2−22u+40 as (u−20)(u−2).
Factor Quadratic Expression: Next, we substitute back (x2+x) for u in the factored form to get ((x2+x)−20)((x2+x)−2).
Substitute Back: Now, we need to factor each quadratic expression further. Starting with (x2+x−20), we look for two numbers that multiply to −20 and add up to 1 (the coefficient of x). These numbers are 5 and −4. So, we can write x2+x−20 as (x+5)(x−4).
Factor Further: Similarly, we factor x2+x−2 by finding two numbers that multiply to −2 and add up to 1. These numbers are 2 and −1. So, we can write x2+x−2 as (x+2)(x−1).
Combine Linear Factors: Finally, we combine all the linear factors to express the original expression as a product of four linear factors: x + \(5)(x - 4)(x + 2)(x - 1)\.
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