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Solve |x + 9| < 12. {x| -3 < x < 21} {x| -21 < x < 3} {x| -12 < x < 12} {x| -3 < x < 3}
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this means that: \[x+9 <\pm 12\] can you proceed from here?
isnt it {x| -3 < x < 3}
?
lets work step by step and see: x+9 <-12 x<-12-9 x<-21 x+9 <12 x<12-9 x<3 or x>-3 combining the two inequalities: -3<x<-21
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