Question

Express the following in the form of atib,
a, beR i = -1. State the values of a and b.
i) (1+21)(-2+i) ii) (1+i)(1-1)​

Answer 1

Step-by-step explanation:

$(1) \: (1 + 2i)( - 2 + i) \\ \: \: \: \: = - 2 + i - 4i + 2 {i}^{2} \\ \: \: \: \: = - 4 - 3i \\ a = - 4 \: \: \: b = - 3 \\ \\ \\ (2) \: (1 + i)(1 - i) \\ \: \: \: = 1 - {i}^{2} \\ \: \: \: = 2 \\ a = 2 \: \: b = 0 \\ \\ hope \: it \: will \: help \: you..$