Multiply (7-8i) (6+5i)

(7-8i)x(6+5i)

multiply the second parentheses by each term from the first parentheses

7(6+51)-8ix(6+5i)

distribute 7 through the parentheses

42+35i-8ix (6+5i)

i2 = -1

42+35i-48i-40 x(-1)

any expression multiplied by equals its opposite

42+35i-48i+40

add numbers

82+35i-48i

82-13i