JEE MATHEMATICS MCQ: COMPLEX NUMBERS

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STATEMENT-I: Let

m, n

be two natural numbers such that

m=a^2+b^2

and

n=c^2+d^2

for some

a, b, c, d \in I

, then there exist

e, f \in I

such that

m n=e^2+f^2

STATEMENT-II: If

z_1, z_2 \in C

, then

\left|z_1+z_2\right|=\left|z_1\right|+\left|z_2\right|

if and only if

z_1 z_2>0

View answer and explanation

Correct option: B

I is true, II is false

Option B (I is true, II is false) is correct because statement I is based on the property of complex number magnitudes, while statement II is only true when z1 and z2 have the same argument.

More Questions from COMPLEX NUMBERS

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The number of non-zero integer solutions of the equation

{\left| {1 - i} \right|^x} = {2^x}

is If

|z|=1

and

z \neq \pm 1

, then for any complex number

z, \frac{z}{1-z^2}

Let

\left|z_r-r\right| \leq r, \forall r=1,2,3, \ldots, n

, then

\left|\sum\limits_{r=1}^n z_r\right|

is less than The roots of the cubic equation

(z+a b)^3=a^3

, where

a \neq 0

represents the vertices of a triangle. If

\alpha, \beta

and

\gamma

are the roots, then find the value of

|\alpha-\beta|

. Number of solutions of the equation

{z^2} + {\left| z \right|^2} = 0,

where

z \in C

is If

2x = - 1 + \sqrt 3 i

, then the value of

{\left( {1 - {x^2} + x} \right)^6} - {\left( {1 - x + {x^2}} \right)^6}

is equal to