1) Write the expression in standard form.

7 / 3-15i

A. 7/78 - 35/78i

B. - 7/78 - 35/78i

C. 7/78 + 35/78i

D. - 7/78 + 35/78i

2) Find the product of the complex number and its conjugate.

1 + 3i

A. 1 + 9i

B. 10

C. - 8

D. 1 - 9i

A complex number is a real number, an imaginary number or a number with both real and imaginary number. Its standard form is:

a + bi

For the expression, 7 / 3-15i

(7 / 3-15i) (3+15i)

21 - 105i / (234)

7/78 - 35/78i

Therefore, the correct answer is option A.