Question

( a + b) (2 + i) = b + 1 + (10 + 2a ) i

Answer 1

Step-by-step explanation:

(a+b)(2+i)=b+1+(10+2a)i

2a+ai+2b+bi=b+1+(10+2a)i

2a+ai+2b+bi=b+1+10i+2a.i

2a+ai +2b+bi-b-1-10i-2ai=0

2a+ai-2ai+2b-b+bi-10i-1=0

2a-ai-b +bi-10i-1=0

Answer 2

Answer:

A=-3 & b=7.

Step-by-step explanation:

Please find the attached image.