Math Problem Statement

Which is equivalent to -3∛16 + ∛128?

Solution

Let's solve the expression 3163+1283-3 \cdot \sqrt[3]{16} + \sqrt[3]{128}.

Step 1: Simplify 163\sqrt[3]{16}

We know: 16=2416 = 2^4 So, [ \sqrt[3]{16} = \sqrt[3]{2^4} = 2^{\frac{4}{3}} ]

Step 2: Simplify 1283\sqrt[3]{128}

We know: 128=27128 = 2^7 So, [ \sqrt[3]{128} = \sqrt[3]{2^7} = 2^{\frac{7}{3}} ]

Step 3: Substitute into the original expression

Now, substitute these into the original expression: 3243+273-3 \cdot 2^{\frac{4}{3}} + 2^{\frac{7}{3}}

Step 4: Factor out 2432^{\frac{4}{3}}

We can factor out 2432^{\frac{4}{3}} from both terms: 243(3+233)=243(3+2)2^{\frac{4}{3}} \left( -3 + 2^{\frac{3}{3}} \right) = 2^{\frac{4}{3}} \left( -3 + 2 \right) This simplifies to: 243(1)=2432^{\frac{4}{3}} \cdot (-1) = -2^{\frac{4}{3}}

Step 5: Match to the answer choices

We have simplified the expression to 243-2^{\frac{4}{3}}, which corresponds to the first option: 243\boxed{-2^{\frac{4}{3}}}

Therefore, the correct answer is the first option.


Would you like further details or have any questions?

Here are 5 related questions to explore further:

  1. How do you simplify cube roots of larger numbers?
  2. Can cube roots be simplified similarly to square roots?
  3. What happens when negative numbers are involved with cube roots?
  4. How do you handle fractional exponents in more complex problems?
  5. What is the general method for factoring expressions like this?

Tip: Remember, cube roots of powers of 2 can often be simplified by expressing the number as a power of 2 and applying fractional exponents.

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Math Problem Analysis

Mathematical Concepts

Algebra
Radicals
Cube Roots
Simplification

Formulas

∛a = a^(1/3)
a^(m/n) = (a^m)^(1/n)

Theorems

Laws of Exponents
Radical Simplification

Suitable Grade Level

Grades 10-12