Work Step by Step
$|u|\lt a~↔~-a\lt u\lt a$ $|u|\leq a~↔~-a\leq u\leq a$ $|u|\gt a~↔~u\lt-a~or~u\gt a$ $|u|\geq a~↔~u\leq-a~or~u\geq a$ $-5\leq x\leq3$ $-5+1\leq x+1\leq3+1$ $-4\leq x+1\leq4$ $|x+1|\leq4$
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