please solve......

Asked by pkartik | 19th Jul, 2009, 07:08: PM

Expert Answer:

(a-b) = 9

(a-b)2 =92

a2 + b2 =81  + 2ab

a2 + b2 =81 +72

a2 + b2  =153

Now on the other hand

(a + b) = x

(a + b)2 = x2

a2 + b2  = x2-2ab

153 = x2 -72

153+72 = x2

225 =x2

a + b = 15 Ans

a + b = 15.........i

a - b = 9 .........ii

adding i & ii

2a = 24

a = 12 ans

Answered by  | 20th Jul, 2009, 12:04: PM

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