4-1.Complex numbers
normal

यदि  $z = x + iy$ तो $|z - 5|$का मान है

A

$\sqrt {{{(x - 5)}^2} + {y^2}} $

B

${x^2} + \sqrt {{{(y - 5)}^2}} $

C

$\sqrt {{{(x - y)}^2} + {5^2}} $

D

$\sqrt {{x^2} + {{(y - 5)}^2}} $

Solution

(a) $z = x + iy$, तब $|z – 5|\, = \,|x + iy – 5|\, = \,|x – 5 + iy|$

$ = \sqrt {{{(x – 5)}^2} + {y^2}} $.

Standard 11
Mathematics

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