If a+b = 8 and ab= -1, evaluate a² + b²
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Answered by
11
Answer:
66
Step-by-step explanation:
(a+b)² = a² + b² + 2ab
a² + b² = (a+b)² - 2ab
= 8² - 2 × (-1)
= 64 + 2
= 66
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