tentukan invers dari fungsi fungsi berikut. a. t(x) = 3pangkat2x - 15 b. u(x) = 2pangkat3x-pangkat9 c. w(x)= pangkat5 log (5x+125) d q(x) = log (2x + 7) - 10 to

a) 3^2x - 15 = y
3^2x = y + 15
2x = ³log (y+15)
x = (½).³log (y+15)
x = ³log √(y+15)
t-¹(x) = ³log √(x+15)

b) 2^(3x-9) = y
3x - 9 = ²log y
3x = ²log y + 9
x = (⅓).²log y + 9/3
x = (²log ³√y) + 3
u-¹(x) = (²log ³√y) + 3

c) ^5log (5x+125) = y
^5log 5x + ^5log 125 = y
^5log 5x + 3 = y
^5log 5x = y - 3
5x = 5^(y-3)
x = 5^(y-3)/5
x = 5^(y-4)
w-¹(x) = 5^(x-4)

d) log (2x+7) - 10 = y
log (2x+7) = y+10
2x + 7 = 10^(y+10)
2x = 10^(y+10) - 7
x = {10^(y+10) - 7} / 2
q-¹(x) = {10^(x+10) - 7} / 2