Q. Rewrite the expression as a product of four linear factors:(x2−3x)2−16(x2−3x)−36Answer:
Identify Expression: Let's first identify the expression we need to factor: (x2−3x)2−16(x2−3x)−36. Notice that this is a quadratic in form, where the variable part is (x2−3x). Let's set u=x2−3x to simplify our expression.
Set Simplification Variable: Now, rewrite the expression in terms of u: u2−16u−36. This is a quadratic equation that we can factor.
Rewrite in Terms of u: To factor the quadratic equation u2−16u−36, we need to find two numbers that multiply to −36 and add up to −16. These numbers are −18 and +2.
Factor Quadratic Equation: Now we can write the factored form of the quadratic equation: (u−18)(u+2).
Write Factored Form: Next, we substitute back x2−3x for u to get the factored form in terms of x: (x2−3x−18)(x2−3x+2).
Factor x2−3x−18: We now need to factor each of these quadratic expressions further. Starting with x2−3x−18, we look for two numbers that multiply to −18 and add up to −3. These numbers are −6 and +3.
Factor x2−3x+2: The factored form of x2−3x−18 is (x−6)(x+3).
Combine Linear Factors: Now, we factor x2−3x+2. We look for two numbers that multiply to +2 and add up to −3. These numbers are −2 and −1.
Combine Linear Factors: Now, we factor x2−3x+2. We look for two numbers that multiply to +2 and add up to −3. These numbers are −2 and −1.The factored form of x2−3x+2 is (x−2)(x−1).
Combine Linear Factors: Now, we factor x2−3x+2. We look for two numbers that multiply to +2 and add up to −3. These numbers are −2 and −1.The factored form of x2−3x+2 is (x−2)(x−1).Finally, we combine all the linear factors to express the original expression as a product of four linear factors: (x−6)(x+3)(x−2)(x−1).
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