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If a and b are the roots of x^2 - 5x + 6 = 0, what is the value of a^2 + b^2?
A11
B25
C12
D13
Answer & Solution
Correct answer: D. 13
a^2 + b^2 = (a+b)^2 - 2ab = 25 - 12 = 13.
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