What is the product of and (6+5i) and (3-7i) ? -17-27i -17+27i 53+27i 53-27i

We are going to make the product step by step.
 We have:
 (6 + 5i) * (3-7i)
 Multiplying:
 ((6) * (3)) + ((6) * (- 7i)) + ((5i) * (3)) + ((5i) * (- 7i))
 Rewriting:
 18 - 42i + 15i - 35i ^ 2
 18 - 42i + 15i - 35 * (- 1)
 18 - 42i + 15i + 35
 53 - 27i
 
 the product of and (6 + 5i) and (3-7i) is:
 53-27i

You have to find the angle i don’t know if i i try