Wednesday, March 20, 2024

Kisi Kisi PAT Matematika Kelas XI no 103

103. Invers dari fungsi 𝑓(π‘₯) = (βˆ’2 + 5π‘₯)/ (2 βˆ’ 4π‘₯) adalah …

a. π‘“βˆ’1(π‘₯) = (βˆ’2π‘₯ βˆ’ 2) / (βˆ’4π‘₯ βˆ’ 5)

b. π‘“βˆ’1(π‘₯) = (2π‘₯ + 2) / (βˆ’4π‘₯ βˆ’ 5)

c. π‘“βˆ’1(π‘₯) = (2π‘₯ + 2) / (4π‘₯ + 5)

d. π‘“βˆ’1(π‘₯) = (2π‘₯ βˆ’ 2) / (4π‘₯ βˆ’ 5)

e. π‘“βˆ’1(π‘₯) = (βˆ’2π‘₯ βˆ’ 2) / (4π‘₯ + 5)


Jawaban :

𝑓(π‘₯) = (βˆ’2 + 5π‘₯)/ (2 βˆ’ 4π‘₯)

y = (βˆ’2 + 5π‘₯)/ (2 βˆ’ 4π‘₯)

y (2 - 4x) = - 2 + 5x

2y - 4xy = - 2 + 5x

- 5x - 4xy = - 2 - 2y

x (- 5 - 4y )= - 2 - 2y

x = (- 2 - 2y) / (- 5 - 4y)

f (y) = ( - 2 - 2y) / (- 5 - 4y)

π‘“βˆ’1(π‘₯) = (- 2 - 2x) / (- 5 - 4x)

π‘“βˆ’1(π‘₯) = (- 2x - 2) / (- 4x - 5)


Jawaban : A


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