Q. Rewrite the expression as a product of four linear factors:(6x2−11x)2−12(6x2−11x)−85Answer:
Identify and Recognize Quadratic Form: Identify the given expression and recognize that it resembles a quadratic in form, where the variable part is (6x2−11x) instead of a simple x. The expression is a quadratic in (6x2−11x):(6x2−11x)2−12(6x2−11x)−85
Set Substitution for Simplification: Let's set a substitution to simplify the expression. Let u=6x2−11x. The expression then becomes:u2−12u−85 This is a quadratic equation in terms of u.
Factor Quadratic Equation: Factor the quadratic equation u2−12u−85. We need to find two numbers that multiply to −85 and add up to −12. These numbers are −17 and 5. (u−17)(u+5)=0
Substitute Back and Factor in Terms of x: Now, substitute back 6x2−11x for u to get the factors in terms of x:(6x2−11x−17)(6x2−11x+5)=0
Factor First Quadratic: Each of these quadratic factors can be further factored into linear factors. We will start with the first one: 6x2−11x−17. To factor this, we need to find two numbers that multiply to 6×−17=−102 and add up to −11. These numbers are −17 and 6. (3x−17)(2x+1)=6x2−11x−17
Factor Second Quadratic: Now, factor the second quadratic: 6x2−11x+5. We need to find two numbers that multiply to 6×5=30 and add up to −11. These numbers are −6 and −5. (3x−5)(2x−1)=6x2−11x+5
Combine Linear Factors: Combine all the linear factors to express the original expression as a product of four linear factors: (3x−17)(2x+1)(3x−5)(2x−1)
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