Q. Rewrite the expression as a product of four linear factors:(x2−3x)2−14(x2−3x)+40Answer:
Identify Expression: Let's identify the expression we need to factor: (x2−3x)2−14(x2−3x)+40Notice that this is a quadratic in form, where (x2−3x) is like a single variable. Let's substitute u=x2−3x to make it clearer.
Rewrite in terms of u: Rewrite the expression in terms of u:u2−14u+40Now we have a quadratic equation in u that we can factor.
Factor Quadratic Equation: Factor the quadratic equation: u2−14u+40=(u−10)(u−4)We found two factors of the quadratic equation.
Substitute back for x: Substitute back x2−3x for u: (u−10)(u−4)=(x2−3x−10)(x2−3x−4) Now we have the expression in terms of x again, but we need to factor each quadratic further.
Factor First Quadratic: Factor the first quadratic x2−3x−10: We look for two numbers that multiply to −10 and add to −3. These numbers are −5 and 2. x2−3x−10=(x−5)(x+2)
Factor Second Quadratic: Factor the second quadratic x2−3x−4: We look for two numbers that multiply to −4 and add to −3. These numbers are −4 and 1. x2−3x−4=(x−4)(x+1)
Combine Linear Factors: Combine all the linear factors to express the original expression:(x2−3x−10)(x2−3x−4)=(x−5)(x+2)(x−4)(x+1)We have rewritten the expression as a product of four linear factors.
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