Q. Rewrite the expression as a product of four linear factors:(2x2−13x)2−(2x2−13x)−42Answer:
Identify Expression: Let's first identify the expression we need to factor:(2x2−13x)2−(2x2−13x)−42Notice that this expression is a quadratic in form, where (2x2−13x) is playing the role of a single variable. Let's substitute u=(2x2−13x) to simplify the expression.
Substitute and Simplify: Substitute u into the expression to get a quadratic in terms of u:u2−u−42Now, we need to factor this quadratic expression.
Factor Quadratic Expression: To factor the quadratic expression u2−u−42, we look for two numbers that multiply to −42 and add up to −1. These numbers are −7 and 6. So, we can write the quadratic as: (u−7)(u+6)
Find Factors: Now, we need to substitute back (2x2−13x) for u in each factor:(2x2−13x−7)(2x2−13x+6)Next, we need to factor each quadratic expression further.
Substitute Back and Factor: Let's start with the first quadratic expression:2x2−13x−7We need to find two numbers that multiply to 2∗(−7)=−14 and add up to −13. These numbers are −14 and 1.However, since the coefficient of x2 is 2, we need to use the AC method or other factoring techniques to factor this expression. Let's check if it can be factored easily.
Factor First Quadratic: Upon attempting to factor 2x2−13x−7, we find that it does not factor nicely into linear factors with integer coefficients. This means we have made a mistake, as the original problem asks for a product of four linear factors. We need to re-evaluate our approach to factoring the quadratic expressions.
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