CBSE Class 9 Answered
factorise the following by proper substitution?
Asked by anandgoyal | 04 Jun, 2008, 10:30: AM
Expert Answer
Solution
Let y2 - 2y =a and z-a = b , then( y2-2y)2 - 3 ( y2-2y)(z-a) +2 ( z-a)2 will be written as a2- 3ab+ 2b2
a2 -ab - 2ab+2b2 = a ( a- b) - 2b( a -b ) = ( a - b ) ( a- 2b) substituting for a and b
(y2 -2y-z + a) (y2 -2y-2z +2a) answer
Answered by | 04 Jun, 2008, 11:33: PM
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