Q. Rewrite the expression as a product of four linear factors:(x2−7x)2+4(x2−7x)−96Answer:
Identify and Recognize Quadratic Form: Identify the given expression and recognize that it resembles a quadratic in form, where the variable part is (x2−7x) instead of x. The expression is: (x2−7x)2+4(x2−7x)−96
Make Simplification Substitution: Let's make a substitution to simplify the expression. Let u=x2−7x. The expression then becomes: u2+4u−96 This is a quadratic equation in terms of u.
Factor Quadratic Equation: Factor the quadratic equation u2+4u−96. We need to find two numbers that multiply to −96 and add up to 4. These numbers are 12 and −8. So, the factored form is (u+12)(u−8).
Substitute Back and Factor: Now, substitute back x2−7x for u in the factored expression to get:(x2−7x+12)(x2−7x−8)
Factor First Quadratic: We now need to factor each quadratic. Starting with x2−7x+12, we look for two numbers that multiply to 12 and add up to −7. These numbers are −3 and −4. So, the factored form is (x−3)(x−4).
Factor Second Quadratic: Next, factor x2−7x−8. We look for two numbers that multiply to −8 and add up to −7. These numbers are −8 and 1. So, the factored form is (x−8)(x+1).
Combine Factors for Final Expression: Combine the factors from the previous steps to write the expression as a product of four linear factors: x−3(x - 4\)(x - 8\)(x + 1\)
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