4-1.Complex numbers
medium

જો $z$ એ સંકર સંખ્યા હોય, તો $|z| + |z - 1|$ ની ન્યૂનતમ કિમત મેળવો.

A

$1$

B

$0$

C

$1/2$

D

એકપણ નહીં.

Solution

(a)First note that $| – z|\, = \,|z|$ and $|{z_1} + {z_2}|\, \le \,|{z_1}| + |{z_2}|$
Now $|z| + |z – 1|\, = \,|z| + |1 – z|\, \ge \,|z + (1 – z)|\, = \,|1| = 1$
Hence, minimum value of $|z| + |z – 1|$is $1.$

Standard 11
Mathematics

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