Himpunan penyelesaian |x−7|−|x−2|=3 adalah ⋯

Jawaban:

(i) x – 7 – (-x+2) =3

2x – 9 = 3

2x = 12

x = 6

(ii) -(x -7) – (x – 2) = 3

-x + 7 – x + 2 = 3

-2x + 9 = 3

-2x = -9

x = 3

HP. {3, 6}