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anonymous

  • one year ago

Medals and fan!! :) log2(x)+log2(x+2) =3 I factored to get x^2+2x-8=0 but i dont know if im right? The answer is 2 at the back of the tb but i am unaware on how to reach that?? Help please

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  1. Mertsj
    • one year ago
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    Factor x^2+2x-8 into (X+4)(x-2)

  2. anonymous
    • one year ago
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    but how come the answer is just 2 and not 2 and -4? @Mertsj

  3. Mertsj
    • one year ago
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    Can't be -4 because 2 to any power is a positive number. In other words, the argument cannot be negative.

  4. anonymous
    • one year ago
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    Yay tysm :) @mertsj

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spraguer (Moderator)
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