Q. Rewrite the expression as a product of four linear factors:(3x2−10x)2−10(3x2−10x)−39Answer:
Identify Expression: Identify the given expression and recognize that it resembles a quadratic in form, where the variable part is (3x2−10x).The expression is: (3x2−10x)2−10(3x2−10x)−39Let's denote u=3x2−10x, so the expression becomes:u2−10u−39
Factor Quadratic: Factor the quadratic expression u2−10u−39. We are looking for two numbers that multiply to −39 and add up to −10. The numbers that satisfy these conditions are −13 and +3. So we can write the quadratic as: (u−13)(u+3)
Substitute and Simplify: Now, substitute back the original expression for u, which is 3x2−10x, into the factored form:(3x2−10x−13)(3x2−10x+3)
Factor First Quadratic: Notice that each quadratic factor can be further factored into two linear factors. We will start with the first quadratic factor:3x2−10x−13To factor this, we need to find two numbers that multiply to 3∗(−13)=−39 and add up to −10. These numbers are the same as before, −13 and +3, but we need to consider the coefficient of x2, which is 3.We can write the factorization as:(3x+1)(x−13)
Factor Second Quadratic: Now, factor the second quadratic factor:3x2−10x+3Again, we need to find two numbers that multiply to 3×3=9 and add up to −10. These numbers are −9 and −1.We can write the factorization as:(3x−1)(x−3)
Combine Linear Factors: Combine all the linear factors to express the original expression as a product of four linear factors:(3x+1)(x−13)(3x−1)(x−3)
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