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:Expression: (x2+3x)2−16(x2+3x)−36We notice that this is a quadratic in form, where the variable part (x2+3x) is squared and appears linearly as well. We can use a substitution method to simplify the factoring process.Let u=x2+3x. Then our expression becomes:u2−16u−36
Factor Quadratic Expression: Now we need to factor the quadratic expression u2−16u−36. This is a standard quadratic factoring problem.We look for two numbers that multiply to −36 and add up to −16. These numbers are −18 and +2.So we can write the quadratic as:(u−18)(u+2)
Substitute and Simplify: Next, we substitute back x2+3x for u to get the expression in terms of x: (x2+3x−18)(x2+3x+2)Now we need to factor each of these quadratic expressions further.
Factor First Quadratic: We start with the first quadratic expression x2+3x−18. We need to find two numbers that multiply to −18 and add up to 3. These numbers are 6 and −3. So we can write the quadratic as: (x+6)(x−3)
Factor Second Quadratic: Now we factor the second quadratic expression x2+3x+2. We need to find two numbers that multiply to 2 and add up to 3. These numbers are 2 and 1.So we can write the quadratic as:(x+2)(x+1)
Combine Factors: Finally, we write the original expression as a product of four linear factors by combining the factors we found: (x+6)(x−3)(x+2)(x+1)This is the expression rewritten as a product of four linear factors.
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