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Question
If a + b = 8, ab = 7 then a2 + b2 = ______.
Options
64
78
50
49
MCQ
Fill in the Blanks
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Solution
If a + b = 8, ab = 7 then a2 + b2 = 50.
Explanation:
a2 + b2 = (a + b)2 − 2ab
= 82 − 2(7)
= 64 − 14
= 50
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Chapter 3: Expansions - MULTIPLE CHOICE QUESTIONS [Page 38]
