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.

Factorize the following: 3x2+108

Solution.

3x2+108=3(x2+36)=3(x2(6i)2)=3(x+6i)(x6i)

Factorize the following: 4x2+40

Solution.

4x2+40=4(x2+10)=4(x2+(10i)2)=4(x+10i)(x10i)