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SEAMO 2020 — Paper E — Grade 9–10 Question 2

SEAMO · SEAMO 2020 — Paper E — Grade 9–10

Question 2

Positive real numbers $a,b$ satisfy $(a+b)^2=400$ and $ab=50$. Find $a^3+b^3$.
  1. $1250$
  2. $2500$
  3. $6400$
  4. $8000$
  5. None of the above