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SASMO 2019 Grade 8 Question 2

SASMO · SASMO 2019 Grade 8

Question 2

Which of the following is correct?

Interpret the algebraic statements as identities for all real variables for which both sides are defined.
  1. $(a+b)^3=a^3+b^3$
  2. $-10^2=100$
  3. $\sqrt{x^2+9y^2}=x+3y$
  4. $\frac{x}{x+y}=\frac{x}{x}+\frac{x}{y}$
  5. None of the above