If a2 b2 16 and 2ab 7 Find all the possible val... - JAMB Mathematics 1990 Question
If a2 + b2 = 16 and 2ab = 7.Find all the possible values of (a - b)
A
3, -3
B
2, -2
C
1, -1
D
3, -1
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Correct Option: A
a2 + b2 = 16 and 2ab = 7
To find all possible values = (a - b)2 + b2 - 2ab
Substituting the given values = (a - b)2
= 16 - 7
= 9
(a - b) = (\pm)9
= (\pm)3
OR a - b = 3, -3
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