PLEASE HELP ITS TIMED I DONT NEED A BIG EXPLAINATION WILL DO BRAINLIEST The complex number 7+9i
represents which radical expression?
A
7+−3−−−√
B
7−−9−−−√
C
7+−9−−−√
D
7+−81−−−−√

Firstly we must know what complex Number is .

Complex number - The number in the form of a + bi ,where a is real part and bi is Imaginary part is called a complex number . Also here value of i ( read as iota ) is √-1 . It can't be represented on the number line and is represented on the Argand Plane .

So , here the complex number given to us is 7 + 9i .

So , it can be written as ,

= 7 + 9i .

= 7 + 9√-1 .

= 7 + √9 × √9 × √-1 .

= 7 + √ 81 × -1 .

= 7 + √-81 .