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CBSE Class 9 Answered

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Asked by Shivangi_2 | 06 Jul, 2008, 10:03: AM
answered-by-expert Expert Answer

1. (m + n/7)3 ( m - n/7)

=(m + n/7)2 (m + n/7) ( m - n/7)

= (m + n/7)2 ( m2 - n2/49)

= m4 -n4/2401 + 2m3n/7 - 2mn3/343

2.  ( x/2 - 2/5) (2/5 - x/2) - x2 + 2x

 = -( x/2 - 2/5)2 - x2 + 2x

= -5x2/4 + 12x/5 -4/25

Q2 If a+b =10 and ab = 16,find the value  of a2  - ab + b2   and a2 + ab + b2

a2  - ab + b2  + 2ab -2ab = (a+b)2 - 3ab = 102 -3* 16 = 52

a2 + ab + b2 + ab -ab = (a+b)2 -ab = 102 + 16 =116

Answered by | 06 Jul, 2008, 03:29: PM

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