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Exercise 5.1 - Chapter 5 Complex Numbers & Quadratic Equations class 11 ncert solutions Maths - SaraNextGen [2024]


Question 1:

Express the given complex number in the form a + ib:https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4120/CHAPTER%205_html_25bac34e.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4120/CHAPTER%205_html_m453d1698.gif

Question 2:

Express the given complex number in the form a + ibi9 + i19

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4121/CHAPTER%205_html_m37a02bf8.gif

Question 3:

Express the given complex number in the form a + ibi–39

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4122/CHAPTER%205_html_6922ff49.gif

Question 4:

Express the given complex number in the form a + ib: 3(7 + i7) + i(7 + i7)

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4123/CHAPTER%205_html_54dd0223.gif

Question 5:

Express the given complex number in the form a + ib: (1 – i) – (–1 + i6)

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4124/CHAPTER%205_html_m42293290.gif

Question 6:

Express the given complex number in the form a + ib:https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4125/CHAPTER%205_html_288d8c03.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4125/CHAPTER%205_html_m748555c9.gif

Question 7:

Express the given complex number in the form a + ib:https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4126/CHAPTER%205_html_3d2ee134.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4126/CHAPTER%205_html_6df08649.gif

Question 8:

Express the given complex number in the form a + ib:  (1 – i)4

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4127/CHAPTER%205_html_m25255def.gif

Question 9:

Express the given complex number in the form a + ib:https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4128/CHAPTER%205_html_m36d4877.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4128/CHAPTER%205_html_5df9f9b4.gif

Question 10:

Express the given complex number in the form a + ib:https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4129/CHAPTER%205_html_7b467239.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4129/CHAPTER%205_html_20f700cf.gif

Question 11:

Find the multiplicative inverse of the complex number 4 – 3i

Answer:

Let z = 4 – 3i

Then,

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4130/CHAPTER%205_html_5a697659.gif = 4 + 3and https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4130/CHAPTER%205_html_30db9220.gif

Therefore, the multiplicative inverse of 4 – 3i is given by

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4130/CHAPTER%205_html_5da9ac7a.gif

Question 12:

Find the multiplicative inverse of the complex number https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4131/CHAPTER%205_html_564ca923.gif

Answer:

Let z = https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4131/CHAPTER%205_html_564ca923.gif

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4131/CHAPTER%205_html_m3879102d.gif

Therefore, the multiplicative inverse ofhttps://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4131/CHAPTER%205_html_564ca923.gif is given by

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4131/CHAPTER%205_html_m160dd3b6.gif

Question 13:

Find the multiplicative inverse of the complex number –i

Answer:

Let z = –i

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4132/CHAPTER%205_html_61daf497.gif

Therefore, the multiplicative inverse of –i is given by

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4132/CHAPTER%205_html_2cba18df.gif

Question 14:

Express the following expression in the form of a + ib.

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4133/CHAPTER%205_html_329119fc.gif

Answer:

https://img-nm.mnimgs.com/img/study_content/curr/1/11/11/165/4133/CHAPTER%205_html_24b3687e.gif

Also Read : Exercise-5.2-Chapter-5-Complex-Numbers-&-Quadratic-Equations-class-11-ncert-solutions-Maths

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