Diketahu f(x) = 5x-1/4x+3 dan f–¹(p)= 4. Nilai p adalah

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fungsi f(x) = 5x-1/4x+3

misalkan y = 5x-1/4x+3
             
 y (4x+3) = 5x - 1
 4xy + 3y = 5x - 1
 4xy - 5x  = -3y - 1
 (4y - 5) x = -3y - 1
   x     = -3y - 1/4y - 5
 
f-1 (p) = 4

-3p - 1/4p - 5 = 4
-3p - 1 = 4(4p - 5)
-3p - 1 = 16p - 20
-3p - 16p = -20 + 1
-19p = -19
p = 1

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