Koh Long Yang's answer to Koyuki Sky's Secondary 4 E Maths Singapore question.

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Koh Long Yang
Koh Long Yang's answer
3 answers (Tutor Details)
think about how to i get below -5. lets say for example -6. can 2^x - 5 give = -6? this counter example shows that 2^x must be a negative number, but can 2^x be a negative number? no