Question

a) |7x-1| = 6
b) |4x+3| = 5
c) |5x+1| = 4
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Answer 1

Explicație pas cu pas:

a)

$|7x-1| = 6$

$7x - 1 = 6 = > 7x = 7 \\ x = 1$

$7x - 1 = - 6 = > 7x = - 5 \\ x = - \frac{5}{7}$

b)

$|4x+3| = 5$

$4x+3 = 5 = > 4x = 2 \\ x = \frac{1}{2}$

$4x+3 = - 5 = > 4x = - 8 \\ x = - 2$

c)

$|5x+1| = 4$

$5x+1 = 4 = > 5x = 3 \\ x = \frac{3}{5}$

$5x+1 = - 4 = > 5x = - 5 \\ x = - 1$

Answer 2

Răspuns:

a. |7x-1|=6

7x=6+1

7x=7

x=1

b. |4x+3|=5

4x=5-3

4x=2

x=1/2

x=0,5

x= 2 la -1

c. |5x+1|=4

5x=4-1

5x=3

x=3/5

x=0,6