Question

(1+2i) (1+3i) (2+i) -1

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Answer 1

Step-by-step explanation:

1(1+3i)+2i(1+3i) (2+i) -1

1+3i+2i+6i^2 (2+i) -1

as i^2=-1 hence

1+5i-6 (2+i) -1

(-5+5i) (2+i) -1

-5(2+i) +5i(2+i) -1

-10-5i +10i +5i^2 -1

-10 -5i +10i-5-1

-16 +5i

hence answer is -16+5i

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