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Math - Properties of Logarithm

posted by on .

Can someone show how to this question.
Loga(x+3) + Loga(x-3) = 3

I don't know if I'm typing this correctly the a is the base.

So, I'm thinking,

Loga((x+3)(x-3)) = 3

(x+3)(x-3) = 3^a
x^2 - 9 = 3^a,
x^2 = 3^a + 9
x = sqrt(3^a + 9)


but now I'm stuck, I don't know how to proceed. I don't know if this is the answer...

  • Math - Properties of Logarithm - ,

    You are mixing up 3^a and a^3
    The base of the logarithm (a) is what gwets raised to a power (3, in this case).

    loga[(x+3)(x-3)] = 3
    loga(x^2-9) = 3
    a^3 = x^2-9
    x = sqrt(a^3 +9)

  • Math - Properties of Logarithm - ,

    Thanks... got it...

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