Q. Rewrite the expression as a product of four linear factors:(x2+2x)2−18(x2+2x)+45Answer:
Identify Expression: Let's first identify the expression we need to factor:(x2+2x)2−18(x2+2x)+45We recognize this as a quadratic in form, where the variable part is (x2+2x). Let's set u=x2+2x to simplify our expression.Our expression becomes:u2−18u+45Now we need to factor this quadratic expression.
Set Variable: We look for two numbers that multiply to 45 and add up to −18. These numbers are −15 and −3. So we can write our quadratic as: (u−15)(u−3)
Factor Quadratic: Now we substitute back x2+2x for u to get:(x2+2x−15)(x2+2x−3)
Find Two Numbers: Next, we need to factor each quadratic. Starting with x2+2x−15, we look for two numbers that multiply to −15 and add up to 2. These numbers are 5 and −3. So we can write x2+2x−15 as: (x+5)(x−3)
Substitute Back: Now we factor x2+2x−3. We look for two numbers that multiply to −3 and add up to 2. These numbers are 3 and −1. So we can write x2+2x−3 as: (x+3)(x−1)
Factor x2+2x−15: Finally, we combine all the factors to express the original expression as a product of four linear factors:(x+5)(x−3)(x+3)(x−1)
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