kritima
show that :I b^2+c^2 a^2 a^2 I
I b^2 c^2+a^2 b^2 I
I c^2 c^2 a^2+b^2 I
=4a^2b^2c^2 where I ... I is a sign of determinant
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kritima
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can we do something like R1-R2-R3
kritima
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|dw:1332770725462:dw|
kritima
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question is something like |dw:1332771115290:dw|
y2o2
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does the determinant look like this ?!
kritima
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yes
kritima
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i think after R1-R2-R3 we can take -2 common from R1 then R2-R1 and again R3-R1
kritima
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i can't go further after this
so do you have any idea?
y2o2
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No, not yet
kritima
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now i got it
kritima
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|dw:1332772038295:dw|
kritima
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but i still want you to check out for me
kritima
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i don"t think my process is right
y2o2
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i solved it
y2o2
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1) R1+R3
2) R1-R2
3) take 2 as a common factor from R1
4) R3-R1
5)R2-R3 "you will find 3 Zero's in the determinant"
6) find the value of the final determinant and you'll get the answer