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SEAMO 2021 — Paper E — Grade 9–10 Question 15

SEAMO · SEAMO 2021 — Paper E — Grade 9–10

Question 15

Find $x$ if $2^{x+1}+2^x+2^{x-1}=56\sqrt2$.
  1. $\frac72$
  2. $4$
  3. $\frac92$
  4. $5$
  5. None of the above