Question

(3-21) (2 +31)
Find the conjugate of
(1 + 2i)(2-1)​

Answer 1

Step-by-step explanation:

$(3 - 2i)(2 + 3i)$

ON SOLVING IT WE GET

$6 + 9i - 4i - 6 {i}^{2}$

$6 + 6 + 5i$

$12 + 5i$

CONJUGATE OF (3-2i)(2+3i) is

$12 - 5i$

2)

$(1 + 2i)(2 - i)$

ON SOLVING WE GET

$2 - i + 4i - 2 {i}^{2}$

$4 - 3i$

CONJUGATE OF (1+2i)(2-i) IS

$4 + 3i$