book Maths Puzzle Numerical Ability

solve for x: log2x + log2(x+2)=3

the two next to the log is a little two --
this is not from a book it is from a worksheet:)

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book Other Question

how do you write x+2=1/5y in standard form simplify the following algebraic expression

Multiply: (3x + 4) (3x -4)