Q. Rewrite the expression as a product of four linear factors:(x2+5x)2−2(x2+5x)−24Answer:
Identify Expression: Let's first identify the expression we need to factor:Expression: (x2+5x)2−2(x2+5x)−24We notice that this is a quadratic in form, where the variable part (x2+5x) is squared. Let's set a substitution to simplify the expression.Let u=x2+5x.Now our expression becomes:u2−2u−24
Set Substitution: Next, we factor the quadratic expression u2−2u−24 as if it were a regular quadratic equation.We look for two numbers that multiply to −24 and add up to −2. These numbers are −6 and +4.So we can write the factored form as:(u−6)(u+4)
Factor Quadratic Expression: Now we substitute back x2+5x for u to get the expression in terms of x:(x2+5x−6)(x2+5x+4)
Substitute Back to x: We now need to factor each quadratic expression further to get the linear factors.Let's start with the first quadratic expression:x2+5x−6We look for two numbers that multiply to −6 and add up to 5. These numbers are +6 and −1.So we can write the factored form as:(x+6)(x−1)
Factor First Quadratic: Now let's factor the second quadratic expression:x2+5x+4We look for two numbers that multiply to 4 and add up to 5. These numbers are +4 and +1.So we can write the factored form as:(x+4)(x+1)
Factor Second Quadratic: Finally, we combine all the linear factors to express the original expression as a product of four linear factors: x + \(6)(x - 1)(x + 4)(x + 1)\
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