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

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.