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b.
t : ( t + 1 ) = ( t - 1) : ( t - 4 )
t × ( t - 4 ) = ( t - 1 ) × ( t + 1 )
t² - 4t = t² + t - t - 1
t² - 4t = t² - 1
t² - t² - 4t= -1
-4t= -1
t= -1/-4
t= 1/4
Jadi, nilai t yang memenuhi adalah 1/4.
b)
( 3t - t ) : 3t = ( t - 3 ) : ( t + 3 )
2t : 3t = (t - 3) : (t +3)
2 : 3 = (t- 3) : (t + 3)
2(t + 3) = 3(t - 3)
2t + 6 = 3t - 9
2t - 3t = -9 - 6
-t = -15
t= 15
Jadi, nilai t yang memenuhi adalah 15.