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Mathematics 67 Online
ThatCreepyBoy:

Given the function f(x) = 3x, find the value of f−1(27). f−1(27) = 1 f−1(27) = 3 f−1(27) = 9 f−1(27) = 81

Vocaloid:

if y = 3x, then we can switch x and y to find the inverse x = 3y solve for y again

ThatCreepyBoy:

v.v I didn't notice that you commented on here sorry

ThatCreepyBoy:

I don't understand v.v

SkyVoltage43:

f(x)=27 when x=9. The point is then (9, 27). If we switch places with x and y, we get (27, 9). f-1(27) = 9

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