please tell anybody
very important question
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Answer:
13
Explanation:
α + β = -7
αβ = 3
( α - β )² = α² + β² - 2αβ ∴[ α² + β² = ( α + β )² - 2αβ ]
= ( α + β )² - 2αβ - 2αβ
= ( α + β )² - 4αβ
= 7² - 4 × 3²
= 49 - 36 = 13
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