Himpunan penyelesaian dari|4-2/5x|-7=13

Himpunan penyelesaian dari|4-2/5x|-7=13

Jawaban:

$|4 - frac{2}{5}x | - 7 = 13 \ | frac{20 - 2x}{5} | = 20 \ ( frac{20 - 2x + 100}{5} )( frac{20 - 2x - 100}{5} ) = 0 \ ( frac{ - 2x + 120}{5} )( frac{ - 2x - 80}{5} ) = 0 \ frac{ - 2x + 20}{5} = 0 \ - 2x + 120 = 0 \ x = 60 \ atau \ frac{ - 2x - 80}{5} = 0 \ - 2x - 80 = 0 \ x = - 40$