if a-b=7 and ab=30 find a²+b²
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Answer:
a²+ b²= 109
Step-by-step explanation:
a - b = 7
Squaring both the sides
(a-b)² = 49
a² + b² - 2ab = 49
a²+ b² - 2(30) = 49
a² + b² = 49 + 60 = 109
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