Math Problem Statement

Solve -25x + 50 + x^3 - 2x^2 = 0 and write the polynomial in factored form.

Solution

Let's solve the polynomial 25x+50+x32x2=0-25x + 50 + x^3 - 2x^2 = 0 and express it in factored form as requested in the image.

Step 1: Rewrite in Standard Form

The given polynomial is already close to standard form but we can rearrange it as: x32x225x+50=0x^3 - 2x^2 - 25x + 50 = 0 This is the standard form of the cubic equation.

Step 2: Use Synthetic Division to Find Roots

To use synthetic division, we first try to find possible rational roots using the Rational Root Theorem. The possible rational roots are the factors of the constant term (50) divided by the factors of the leading coefficient (1). So, the possible roots are: ±1,±2,±5,±10,±25,±50\pm 1, \pm 2, \pm 5, \pm 10, \pm 25, \pm 50

Let's try some values by substituting them into the polynomial:

  • For x=2x = 2: (2)32(2)225(2)+50=8850+50=0(2)^3 - 2(2)^2 - 25(2) + 50 = 8 - 8 - 50 + 50 = 0 So, x=2x = 2 is a root.

Step 3: Perform Synthetic Division

We divide x32x225x+50x^3 - 2x^2 - 25x + 50 by x2x - 2.

The coefficients of the polynomial are: 1,2,25,501, -2, -25, 50.

Performing synthetic division:

2 & 1 & -2 & -25 & 50 \\ & & 2 & 0 & -50 \\ \hline & 1 & 0 & -25 & 0 \\ \end{array}$$ The quotient is $$x^2 - 25$$ with no remainder, meaning the factorization so far is: $$(x - 2)(x^2 - 25) = 0$$ ### Step 4: Factor $$x^2 - 25$$ The expression $$x^2 - 25$$ is a difference of squares, which factors as: $$x^2 - 25 = (x - 5)(x + 5)$$ ### Step 5: Final Factored Form Thus, the factored form of the polynomial is: $$(x - 2)(x - 5)(x + 5) = 0$$ ### Step 6: Complete the Fill-in-the-Blank Questions - The polynomial equation has at most **3** real roots. - The leading term is **$$x^3$$**. - The leading coefficient is **1**. - The degree is **3**. - The roots or zeros of the polynomial are **2, 5**, and **-5**. - The factors are $$(x - 2), (x - 5), (x + 5)$$. Would you like more details or have any questions? ### Related Questions: 1. How does synthetic division work in polynomial division? 2. What is the Rational Root Theorem, and how is it applied? 3. Can you factor a cubic polynomial using other methods besides synthetic division? 4. What is the difference of squares, and when can it be used in factoring? 5. How do you determine the number of real roots in a polynomial? ### Tip: When solving cubic equations, always start by checking for simple integer roots using the Rational Root Theorem before proceeding with more advanced methods.

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Math Problem Analysis

Mathematical Concepts

Algebra
Polynomial Equations
Synthetic Division
Factoring
Rational Root Theorem

Formulas

Difference of Squares: a^2 - b^2 = (a - b)(a + b)

Theorems

Rational Root Theorem

Suitable Grade Level

Grades 10-12