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maths logarithms help

http://s13.postimg.org/6j6260puv/maths1.pngt

its the part about where they put log1000=3 just as 3, when i put it as -3? is this right?
Original post by goodmorning1
http://s13.postimg.org/6j6260puv/maths1.pngt

its the part about where they put log1000=3 just as 3, when i put it as -3? is this right?


log10(1000)=3 because 103=1000.

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