Understanding and Simplifying Exponents

Aug 2, 2024

Simplifying Exponents

Basic Properties of Exponents

  • Multiplying Common Bases: When multiplying with a common base, add the exponents.

    • Example: (x^4 \times x^5 = x^{4+5} = x^9)
  • Dividing Common Bases: When dividing with a common base, subtract the exponents.

    • Example: (\frac{x^7}{x^3} = x^{7-3} = x^4)
  • Raising an Exponent: When raising one exponent to another, multiply the exponents.

    • Example: ((x^3)^4 = x^{3 \times 4} = x^{12})
  • Zero Exponent: Anything raised to the zero power equals 1.

    • Example: (x^0 = 1)
  • Negative Exponents: Move to the opposite side of the fraction and change the sign of the exponent.

    • Example: (x^{-3} = \frac{1}{x^3})

Example Problems

  • Calculate (-32):
    • (-32 = -3 \times -3 = -9)
    • (-32 = \text{negative 1} \times 3^2 = -9)

Simplifying Expressions

  1. First Example: (x^3 \text{ raised to the 5th power} ) and (x^7 / x^{12})

    • Solution:
      • For multiplication: ((x^3)^5 = x^{15})
      • For division: (x^{7-12} = x^{-5} = \frac{1}{x^5})
  2. Second Example: (3x^2) raised to the 3rd power:

    • ((3x^2)^3 = 3^3 \times (x^2)^3 = 27x^6)
  3. Third Example: (-2x^3y^4) raised to the second power:

    • ((-2x^3y^4)^2 = (-2)^2 \times (x^3)^2 \times (y^4)^2 = 4x^6y^8)
  4. Multiplying Expressions: (5x^3 \times 4x^7)

    • Multiply coefficients: (5 \times 4 = 20)
    • Add exponents of x: (x^{3+7} = x^{10})
    • Result: (20x^{10})
  5. Another Example: (24x^7y^3 / 8x^4y^{-2})

    • Divide coefficients: (\frac{24}{8} = 3)
    • Subtract exponents: (x^{7-4} = x^{3}) and (y^{3 - (-2)} = y^{5})
    • Result: (3x^3y^5)
  6. Final Example: (35x^3y^5 / 63x^4y^7)**

    • Simplify coefficients: (\frac{35}{63} = \frac{5}{9})
    • Subtract exponents: (x^{3-4} = x^{-1} = \frac{1}{x}) and (y^{5-7} = y^{-2} = \frac{1}{y^2})
    • Result: (\frac{5}{9} \frac{1}{xy^2} = \frac{5}{9xy^2})
    • Final answer: (\frac{5}{9y^2} \times x^{2 \text{ raised to the 2 power}} = \frac{5x^{2y^4}}{9})

Key Takeaways

  • When simplifying exponents, remember the rules of addition, subtraction, zero, and negative exponents.
  • Practice with multiple examples to gain a solid understanding.