Question

Ex. 1 : Write (1+2i) (1+3i) (2+i)' in the form
a+ib​

Answer 1

Answer:

-5(3-i)

• (1+2i) (1+3i) (2+i)
• [1(1+3i) + 2i(1+3i)] (2+i)
• (1+3i+2i+6i²) (2+i)
• (-5+5i) (2+i)
• 5(2+i)+5i(2+i)
• -10-5i+10i+5i²
• -15+5i
• -5(3-1)

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