Question 936639
"If a>0 and b>0, compare: A. a+b B. sqrt(a^2+b^2)"

Here the possible answers are: "A" if A is greater. "B" if B is greater. "C" if both are equal, and "D" if there's not enough information to solve the problem.
Can you explain it to me?
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Square both the values A & B
A. (a+b)^2 = a^2 + 2ab + b^2
B. (sqrt(a^2+b^2))^2 = a^2 + b^2
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A^2 is greater by 2ab --> a+b is greater (by how much is not known)