(1) Prove that the product xy of two real numbers x and y is nonnegative if and only if the absolute value x + yl of their sum is the sum |x| + |y| of their absolute values.

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(1) Prove that the product xy of two real numbers x and y is nonnegative if and only if the absolute value |x + y|
of their sum is the sum |x| + |y| of their absolute values.
Transcribed Image Text:(1) Prove that the product xy of two real numbers x and y is nonnegative if and only if the absolute value |x + y| of their sum is the sum |x| + |y| of their absolute values.
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