Q. Rewrite the expression as a product of four linear factors:(x2−3x)2−22(x2−3x)+72Answer:
Identify and Set Up: Let's identify the given expression and set it up for factoring:The expression is a quadratic in terms of x2−3x, which can be represented as:Let y=x2−3xThen the expression becomes:y2−22y+72Now we will factor this quadratic equation.
Find Factors: We need to find two numbers that multiply to 72 and add up to −22. These numbers are −18 and −4 because −18×−4=72 and −18+−4=−22.So we can factor the quadratic as:(y−18)(y−4)
Substitute and Simplify: Now we substitute back x2−3x for y to get: (x2−3x−18)(x2−3x−4)
Factor x2−3x−18: Next, we need to factor each quadratic expression 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. So we can factor x2−3x−18 as: (x−6)(x+3)
Factor x2−3x−4: Now, we factor x2−3x−4 by finding two numbers that multiply to −4 and add up to −3. These numbers are −4 and +1. So we can factor x2−3x−4 as: (x−4)(x+1)
Write as Product: Finally, we write the original expression as a product of four linear factors: x - \(6)(x + 3)(x - 4)(x + 1)\
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