If a + b = 10 and ab = 21, what is the value of \(a^2 + b^2\)?
A. 42
B. 100
C. 58
D. 79
1 answer
Best answer
Answer: C. 58
Answer: (C) 58
\(a^2 + b^2 = (a + b)^2 - 2ab = 100 - 42 = 58\).
Doubtly AI
· 27 Oct 2026
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