Q. Rewrite the expression as a product of four linear factors:(3x2−5x)2−20(3x2−5x)+96Answer:
Identify Given Expression: Identify the given expression and recognize that it resembles a quadratic in form, where the quadratic term is (3x2−5x)2, the linear term is −20(3x2−5x), and the constant term is +96. We can treat 3x2−5x as a single variable, say u, and rewrite the expression as a quadratic in terms of u.Let u=3x2−5x. Then the expression becomes u2−20u+96.
Factor Quadratic Expression: Factor the quadratic expression u2−20u+96. We are looking for two numbers that multiply to 96 and add up to −20. These numbers are −12 and −8, since −12×−8=96 and −12+−8=−20.So, u2−20u+96 factors to (u−12)(u−8).
Substitute Back and Expand: Substitute back 3x2−5x for u in the factored form.We get (3x2−5x−12)(3x2−5x−8).
Factor First Quadratic: Now, we need to factor each quadratic expression (3x2−5x−12) and (3x2−5x−8) into two linear factors.Starting with (3x2−5x−12), we look for two numbers that multiply to 3×−12=−36 and add up to −5. These numbers are −9 and +4, since −9×4=−36 and −9+4=−5.So, 3x2−5x−12 factors to (3x2−5x−8)0.
Factor Second Quadratic: Next, factor (3x2−5x−8). We look for two numbers that multiply to 3×−8=−24 and add up to −5. These numbers are −6 and +1, since −6×1=−24 and −6+1=−5.So, 3x2−5x−8 factors to (3x+1)(x−8).
Combine Linear Factors: Combine the linear factors from the previous steps to express the original expression as a product of four linear factors.The final factored form is (3x+4)(x−3)(3x+1)(x−8).
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