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z1=1+2i and z2=2+3i. Find z1z2.(a) 2+6i(b) -4+0i(c) -4+7i(d) 8+7iThe question was posed to me by my college professor while I was bunking the class.My question is from Complex Numbers-2 in division Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

The CORRECT answer is (c) -4+7i

Best explanation: Z1Z2 = (1+2i) (2+3I)

= 2 + 3i + 4I -6

= -4 + 7i.



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