Question

5. Решить уравнение: |0,4x + 7| = 6,5.

A) -12,5; B) -33,75; -1,25; C) 1,25; 33,75; D) -33,75.​

Answer 1

Ответ: C) 1,25 ; 33,75

$|0.4x + 7| = 6.5 \\ 0.4x + 7 = 6.5 \\ 0.4x = - 0.5 \\ x = 1.25 \\ \\ 0.4x - 7 = 6.5 \\ 0.4x = 13.5 \\ x = 33.75$