complex number

If Z=X+iy then find |z|=

• X²+Y²

• Root of x²+y²

• X²-Y²

• Root of x²-y2

Which axis is known as real axis in argand plane?

• X -axis

• Y-axis

• any axis

• None of these

Which axis is known as imaginary axis in argand plane?

• X- axis

• Y-axis

• any axis

• none of these

 $3+3i+8-2i-7$  

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i
• 63 - 24i  - 12i²
• 51 - 24i
• 58 + 60i

Conjugate of 2i is

• 2i

• 1/2i

• -2i

• -2

i⁶⁶

• 1
• i
• -1
• -i

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i
• 63 - 24i  - 12i²
• 51 - 24i
• 58 + 60i

The expression (2 + 3i)² is equal to

• -5
• -5 + 12i
• 13
• 13 + 12i

What does i² equal?

• -1

• √-1

• 1

• -√1