CBSE Class 10 Answered
please solve......
Asked by pkartik | 19 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 | 20 Jul, 2009, 12:04: PM
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