Advanced MathMediumMultiplying powers with fractional exponents
Advanced Math practice question
For x > 0, which expression is equivalent to x^(1/2) · x^(3/2)?
- A. x²Correct
- B. x^(3/4)
- C. x
- D. x⁴
Answer: A. x²
Same base, so add the exponents: 1/2 + 3/2 = 4/2 = 2. The product is x². (Equivalently, √x · x√x = x · x = x².)
Why the other answers are wrong
- B. x^(3/4)
- You multiplied the exponents: (1/2)(3/2) = 3/4. Multiplying powers of the same base ADDS the exponents.
- C. x
- x is x^1, which would come from 1/2 + 1/2. The second exponent is 3/2, not 1/2.
- D. x⁴
- You added the numerators, 1 + 3 = 4, and dropped the denominators. The exponents are halves: 1/2 + 3/2 = 2.
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