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If A is a square matrix such that A^2 =I , then find the value of (A+I)^3 +(A-I)^3 -7A

Posted by Shivam Kumar 7 years, 2 months ago

CBSE > Class 12 > Mathematics

7 answers

G K 7 years, 2 months ago

Sekhar.....I think u speak in english daily.....thatswhy u write very nicely....so much impressed....?....

G K 7 years, 2 months ago

Thnx shekhar.....but plzzzz dont write anything.....i dont like....sorry if u feel bad......

Vishnu Tiwari 7 years, 2 months ago

It came in the 12th class exam

Shrey Shekhar 7 years, 2 months ago

I see you helping a lot of people Megha Yadav (and tolerating their bullshit). You have a kind heart and I respect that. I am kinda jealous of your knowledge of things

G K 7 years, 2 months ago

(A-I)^3 + (A+I)^3 - 7A = A^3 - 3A^2 + 3A - I^3 + A^3 + 3A^2 + 3A + I^3 - 7A = 2A^3 + 6A - 7A = 2A^2 . A + 6A - 7A = 2I.A + 6A - 7A = 2A + 6A - 7A = 8A - 7A = A

G K 7 years, 2 months ago

For ex. ...2^4=16....2 to the power 4 is 16

Bhanu Behl 7 years, 2 months ago

What does ^ this sign mean?

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