Q. Rewrite the expression as a product of four linear factors:(x2+4x)2−9(x2+4x)−36Answer:
Identify Expression: Let's first identify the expression we need to factor: (x2+4x)2−9(x2+4x)−36.This expression resembles a quadratic in form, where (x2+4x) is our "variable". Let's substitute y=x2+4x to make it look more like a standard quadratic equation.
Substitute y: Substitute y into the expression to get: y2−9y−36. Now we have a quadratic equation in terms of y, which we can factor.
Factor Quadratic Equation: Factor the quadratic equation y2−9y−36. We are looking for two numbers that multiply to −36 and add up to −9. These numbers are −12 and +3. So, the factored form is (y−12)(y+3).
Substitute x2+4x: Now we need to substitute x2+4x back in for y to get: (x2+4x−12)(x2+4x+3).
Factor x2+4x−12: Next, we need to factor each of these quadratic expressions further. Starting with x2+4x−12, we look for two numbers that multiply to −12 and add up to 4. These numbers are 6 and −2. So, the factored form is (x+6)(x−2).
Factor x2+4x+3: Now, factor x2+4x+3. We look for two numbers that multiply to 3 and add up to 4. These numbers are 3 and 1. So, the factored form is (x+3)(x+1).
Combine Linear Factors: Finally, we combine all the linear factors to express the original expression as a product of four linear factors: (x+6)(x−2)(x+3)(x+1).
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