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Evaluate ∣3x−7∣|3x-7|∣3x−7∣ when x=−2x=-2x=−2.
A
The vertical axis, x=0x=0x=0.
B
For k>0k>0k>0, ∣ax+b∣<k|ax+b|<k∣ax+b∣<k is equivalent to −k<ax+b<k\boxed{-k<ax+b<k}−k<ax+b<k.
C
For k>0k>0k>0, ∣ax+b∣>k|ax+b|>k∣ax+b∣>k is equivalent to ax+b<−kax+b<-kax+b<−k or ax+b>kax+b>kax+b>k.
D
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3.1 Algebra and functions (A-level only) Flashcards
21 flashcards on CCEA A Level Maths 3.1 Algebra and functions (A-level only): the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.