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Question is wrong!
Step-by-step explanation:
Given,
a² + b² = 117
ab = 54
a + b = ?
we know,
(a+b)² = a² + b² +2ab
(a+b)² = 117 + 108
(a+b)² = 225
a + b = 15
a - b = ?
we know,
(a - b)² = a² + b² - 2ab
(a - b)² = 117 - 108
(a - b)² = 15
a - b = √15
a + b / a - b
= 15/√15
= √15
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