![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
F (x) = lgx image and 10 x power image
Lgx + lgx square + +Lgx10 power = 110 x =?
Lgx + lgx square + +Lgx10 power = 110
lgx+2lgx+… +10lgx=110
55lgx=110
lgx=2
x=100
Let a and B be the two real roots of the equation (lgx) ^ 2-lgx ^ 2-3 = 0, and find the value of logab + lgba
Wrong question. The original question is:
Let a and B be the two real roots of the equation (lgx) ^ 2 - lgx ^ 2 - 3 ≡ 0, and find the value of ㏒ AB + ㏒ ba
Let lgx = Z, lgx ^ 2 = 2Z, (lgx) ^ 2 = Z ^ 2
So the original equation is Z ^ 2-2z-3 = 0
Z = - 1 or Z = 3 is lgx = - 1 or 3
You should know the following
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