Q. Rewrite the expression as a product of four linear factors:(3x2−14x)2−22(3x2−14x)+85Answer:
Recognize Quadratic Form: Recognize that the given expression is a quadratic in form, where the variable part is (3x2−14x). Let's denote u=3x2−14x to see the structure more clearly.
Rewrite in Terms of u: Rewrite the expression in terms of u: (u)2−22u+85.
Factor Quadratic Expression: Factor the quadratic expression in u: (u)2−22u+85 can be factored into (u−a)(u−b), where a and b are the roots of the quadratic equationu2−22u+85=0.
Find Roots: Find the roots of the quadratic equation by using the factoring method or the quadratic formula. The quadratic formula is u=2a−b±b2−4ac, where a=1, b=−22, and c=85.
Calculate Discriminant: Calculate the discriminant: Δ=b2−4ac=(−22)2−4(1)(85)=484−340=144.
Find Square Root: Find the square root of the discriminant: Δ=144=12.
Use Quadratic Formula: Find the two roots using the quadratic formula: u=222±12. This gives us two roots: u=17 and u=5.
Rewrite Factored Form: Rewrite the factored form using the roots: (u−17)(u−5).
Substitute back for u: Substitute back 3x2−14x for u to get the factored form in terms of x: (3x2−14x−17)(3x2−14x−5).
Factor First Quadratic: Notice that each quadratic factor can be further factored into linear factors because they are both quadratic expressions with real roots. We will factor each quadratic separately.
Write Factored Form: Factor the first quadratic 3x2−14x−17. We look for two numbers that multiply to −3×17=−51 and add to −14. These numbers are −17 and 3.
Factor Second Quadratic: Write the factored form of the first quadratic: \(3x + 3)(x - 17)\.
Write Factored Form: Factor the second quadratic 3x2−14x−5. We look for two numbers that multiply to −3×5=−15 and add to −14. These numbers are −15 and 1.
Combine Linear Factors: Write the factored form of the second quadratic: (3x+1)(x−5).
Combine Linear Factors: Write the factored form of the second quadratic: \(3x + 1)(x - 5)\.Combine the linear factors to express the original expression as a product of four linear factors: \(3x + 3)(x - 17)(3x + 1)(x - 5)\.
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