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SASMO 2019 Grade 9 Question 4

SASMO · SASMO 2019 Grade 9

Question 4

Which of the following is true?

Interpretation: Read each statement as an identity, wherever defined; the denominator in D is −2⁴, not (−2)⁴.
  1. $\sqrt{81}=\pm9$
  2. $(x^{12})^{18}=x^{30}$
  3. $5x^{-1}=\frac1{5x}$
  4. $-\frac{2(-x+1)(x+1)}{32}=\frac{1-x^2}{-2^4}$
  5. None of the above