Let f (z) = \frac{az + b}{cz + d}. If f (z_{1}) \: = \:f(z_{2}) for all z_{1}\: \neq \:z_{2},\:a\: = \:2,\:b\: = \:4\:and\:c\: = \:5, then d should be equal to __________.

GATE Electronics and Communications (EC) 2015 Shift 2 Solved Paper

Question : 13 of 65

Marks: +1, -0

Let

f (z) = \;{az\;+\;b}/{cz\;+\;d}.

f (z_{1}) \: = \:f(z_{2})

for all

z_{1}\: ≠ \:z_{2},\:a\: = \:2,\:b\: = \:4\:and\:c\: = \:5

, then d should be equal to __________.

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