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1.Relation and Function
easy
જો $f(x) = {x^2} + 1$, તો ${f^{ - 1}}(17)$ અને ${f^{ - 1}}( - 3)$ મેળવો.
A
$4, 1$
B
$4, 0$
C
$3, 2$
D
એકપણ નહી.
Solution
(d) Let $y = {x^2} + 1$ ==> $x = \pm \sqrt {y – 1} $
==> ${f^{ – 1}}(y) = \pm \sqrt {y – 1} $
==> ${f^{ – 1}}(x) = \pm \sqrt {x – 1} $
==> ${f^{ – 1}}(17) = \pm \sqrt {17 – 1} = \pm 4$
and ${f^{ – 1}}( – 3) = \pm \sqrt { – 3 – 1} = \pm \sqrt { – 4} $, which is not possible.
Standard 12
Mathematics
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