Question 3, Review Exercise
Solutions of Question 3 of Review Exercise of Unit 01: Complex Numbers. This is unit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textbook Board, Islamabad, Pakistan.
Question 3(i)
Factorize the following: 3x2+108
Solution.
3x2+108=3(x2+36)=3(x2−(6i)2)=3(x+6i)(x−6i)
Question 3(ii)
Factorize the following: 4x2+40
Solution.
4x2+40=4(x2+10)=4(x2+(√10i)2)=4(x+√10i)(x−√10i)
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