algebra!
What are the answers to these questions?
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1 solution
Please....please....tell us how to solve that too :P
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x 7 + ( x 7 ) 1 = ( x 3 + ( x 3 ) 1 ) ( x 4 + ( x 4 ) 1 = x 7 + x + x 1 + ( x 7 ) 1
x 9 + ( x 9 ) 1 = [ x 3 + ( x 3 ) 1 ] 3 − 3 ( ( x 3 ) 1 + x 3 )
now just substitute the values you will get your answer
Sorry i could not respond you due to some problem. Thanks to @Megh. Just take a look at my note You can find the clue to deal with such expression.
Try this also.
x 2 + 1 = 3 x => ( x + x 1 ) = 3 .Now ( x + x 1 ) 3 = x 3 + x 3 1 + 3 ( x + x 1 ) putting the values x 3 + x 3 1 = 1 8 ..... The option having this value, as you can see, is unique. So no need to solve that bulky expression.