13 13 Multiply and simplify 4 5i7 2i Write the answer in th

13.

13. Multiply and simplify: (4 5i)(7 + 2i).

Write the answer in the form a + bi, where a and b are real numbers.

Solution

(4-5i)(7+2i)

28+8i-35i-10i²

28-10(-1)-27i

28+10-27i

38-27i