ICSE Class 9 Answered
If a+b=8 and ab=12 find (a)a2+b2
(b)the difference between a and b
Asked by Shankar.kmp143 | 08 Jul, 2019, 05:36: PM
Expert Answer
Given .... a+b=8 and ab=12
a. (a + b)2 = a2 + b2 + 2ab
→ a2 + b2 = (a + b)2 - 2ab = (8)2 - 2(12)= 64 - 24 = 40
b. (a - b)2 = a2 + b2 - 2ab = 40 - 2(12) = 40 - 24 = 16
→ a - b = ± 4
Answered by Yasmeen Khan | 08 Jul, 2019, 06:36: PM
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