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Find multiplicative inverse of 3+5i.(a) 87+145i(b) 87-145i(c) 145-87i(d) 145+87iI have been asked this question in homework.My enquiry is from Complex Numbers-2 in division Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

The correct ANSWER is (B) 87-145i

The explanation is: We KNOW, Z*\(\bar{z}\) = |z|^2.

(1/z) = \(\bar{z}\)|z|^2

z^-1=(3-5i) (3^2+5^2) = (3-5i) (29) = 87-145i.



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