Check sibling questions

We will do questions of these identities

  • Identity VI - (a + b) 3 = a 3 + b 3 + 3ab(a + b)
  • Identity VII -  (a − b) 3 = a 3 - b 3 - 3ab(a - b)

 

Check Algebra Formulas for full list of formulas

 

Lets take an example

Identity VI - (a + b) 3 = a 3 + b 3 + 3ab(a + b)

(2 + 3) 3 = 2 3 + 3 3 + 3(2)(3) (2 + 3)

(5) 3 = 8 + 27 + 18 × 5

125 = 8 + 27 + 90

125 = 125

 

Identity VII -  (a − b)3 = a3 - b3 - 3ab(a - b)

(2 – 3)3 = 23 – 33 – 3(2)(3) (2 – 3)

(–1)3 = 8 – 27 – 18 × (–1)

–1 = 8 – 27 + 18

–1 = 26 – 27

–1 = –1

 

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.