Math Problem Statement

Expand and simplify (4x - 3)(x + 5).

Solution

To expand and simplify (4x3)(x+5)(4x - 3)(x + 5), we’ll apply the distributive property, often known as FOIL (First, Outer, Inner, Last) for binomials.

  1. First Terms: 4xx=4x24x \cdot x = 4x^2
  2. Outer Terms: 4x5=20x4x \cdot 5 = 20x
  3. Inner Terms: 3x=3x-3 \cdot x = -3x
  4. Last Terms: 35=15-3 \cdot 5 = -15

Now, combine these results: 4x2+20x3x154x^2 + 20x - 3x - 15

Combine like terms (20x3x20x - 3x): 4x2+17x154x^2 + 17x - 15

So, the correct answer is: 4x2+17x154x^2 + 17x - 15

The correct option is the first one: 4x2+17x154x^2 + 17x - 15.

Would you like a detailed breakdown of each step, or do you have any further questions?

Here are some related questions for further practice:

  1. What is the expanded form of (3x+2)(2x5)(3x + 2)(2x - 5)?
  2. How would you factor 4x2+17x154x^2 + 17x - 15 if it were presented in this form?
  3. Can you expand and simplify (5x4)(x+3)(5x - 4)(x + 3)?
  4. How do you determine the signs of each term when expanding expressions like this?
  5. What changes if one of the binomials has a different sign pattern, such as (4x+3)(x5)(4x + 3)(x - 5)?

Tip: Always keep track of positive and negative signs carefully when expanding expressions.

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Math Problem Analysis

Mathematical Concepts

Algebra
Polynomials
Expansion

Formulas

(a + b)(c + d) = ac + ad + bc + bd

Theorems

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Suitable Grade Level

Grades 8-10