Math Problem Statement

Factor the polynomial as the product of three binomials. Note: Try using factor theorem for guessing some of the factors. [x^3 -8x^2 +17x -10=]

Solution

To factor the given cubic polynomial x38x2+17x10x^3 - 8x^2 + 17x - 10, we can use the Factor Theorem to find potential factors.

Step 1: Use the Factor Theorem

The Factor Theorem states that if x=ax = a is a root of the polynomial, then (xa)(x - a) is a factor. Let's check for simple integer roots by substituting values of xx into the polynomial f(x)=x38x2+17x10f(x) = x^3 - 8x^2 + 17x - 10.

We'll test small integers like ±1,±2,±5\pm 1, \pm 2, \pm 5, which are reasonable guesses based on the constant term 10-10.

Test x=1x = 1:

f(1)=138(12)+17(1)10=18+1710=0f(1) = 1^3 - 8(1^2) + 17(1) - 10 = 1 - 8 + 17 - 10 = 0 So, x=1x = 1 is a root, and therefore (x1)(x - 1) is a factor.

Step 2: Perform synthetic division

Now that we know one factor is x1x - 1, we can divide the cubic polynomial x38x2+17x10x^3 - 8x^2 + 17x - 10 by x1x - 1 to find the quotient.

Using synthetic division:

1 & 1 & -8 & 17 & -10 \\ & & 1 & -7 & 10 \\ \hline & 1 & -7 & 10 & 0 \end{array}$$ The quotient is $$x^2 - 7x + 10$$, so the polynomial becomes: $$x^3 - 8x^2 + 17x - 10 = (x - 1)(x^2 - 7x + 10)$$ ### Step 3: Factor the quadratic Next, we factor the quadratic $$x^2 - 7x + 10$$. We need two numbers that multiply to $$10$$ and add to $$-7$$. These numbers are $$-5$$ and $$-2$$. Thus: $$x^2 - 7x + 10 = (x - 5)(x - 2)$$ ### Step 4: Write the final factored form Now, combining everything: $$x^3 - 8x^2 + 17x - 10 = (x - 1)(x - 5)(x - 2)$$ This is the fully factored form of the polynomial. Would you like more details on any step or have any other questions? Here are 5 related questions: 1. How does the Factor Theorem help in finding the factors of polynomials? 2. What are the other methods for factoring a cubic polynomial? 3. Can synthetic division be used with non-integer roots? 4. How do you check if a given factorization is correct? 5. What happens if a cubic polynomial has complex roots? **Tip**: Always check for simple integer roots first, as they can significantly speed up the factoring process.

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Math Problem Analysis

Mathematical Concepts

Algebra
Polynomial Factorization
Cubic Equations

Formulas

Synthetic division
Quadratic factorization

Theorems

Factor Theorem

Suitable Grade Level

Grades 10-12