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Powers and Fractional Equations

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Powers and Fractional Equations

Show your working and give exact answers where possible. When solving equations with fractional powers, check that your answers satisfy the original equation.

Decode the index laws

Use the laws of indices to simplify each expression. Assume variables are non-zero where needed.

1.A code lock displays 3² × 3⁵. Simplify this to a single power of 3, then calculate its value.
2.A sensor records (a⁴)³. Simplify the expression as a single power of a.
3.Choose the expression equivalent to 27^(2/3).
  • (∛27)²
  • 27 ÷ 2
  • √(27³)
  • 2∛27
4.A cube-root calculation gives 64^(1/3). Work out its value. Then explain briefly what the exponent 1/3 means.

Crack the fractional-power equations

Use roots and powers to solve. Pay attention to whether an equation can have more than one real solution.

5.Solve x^(1/2) = 7 for the real value of x.
6.Solve x^(2/3) = 9, giving all real solutions. Check both answers in the original equation.
7.A machine follows the rule ½x^(1/2) = 4. Solve for x.
8.A value is transformed by adding 1 and then raising to the power 3/2: (x + 1)^(3/2) = 8. Solve for x, remembering that x + 1 must be non-negative.

Final code challenge

Combine index rules and fractional powers to unlock the final result.

9.Simplify completely: (8x⁶)^(2/3) ÷ (2x²)^(1/3), for x > 0.

2 printable pages

  • Powers and Fractional Equations, page 1 of 2: Decode the index laws, Crack the fractional-power equations

    Page 1

  • Powers and Fractional Equations, page 2 of 2: Final code challenge

    Page 2

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