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Sagot :
|5z + 1| = 21
|5z + 1-1| = 21-1
|5z|=20
|5z/5|=20/5
z=4
Remember if what you put is this sign: |x| and not this sign (x)
This sign, |x|, means absolute value. be careful in using that and do not confuse it with () parentheses.
If you mean |5z+1|=21
Then, it can also mean that:
z=-4.4 is correct.
|5(-4.4)+1|=21
|-22+1| = 21
|-21| = 21, Correct, True
|5z + 1-1| = 21-1
|5z|=20
|5z/5|=20/5
z=4
Remember if what you put is this sign: |x| and not this sign (x)
This sign, |x|, means absolute value. be careful in using that and do not confuse it with () parentheses.
If you mean |5z+1|=21
Then, it can also mean that:
z=-4.4 is correct.
|5(-4.4)+1|=21
|-22+1| = 21
|-21| = 21, Correct, True
[tex]|5z+1|=21\\\\ 5z+1 =21\ \ \ or \ \ \ 5z+1 =-21\\\\ 5z =21-1\ \ \ or \ \ \ 5z =-21-1\\\\ 5z =20\ \ / :5\ \ \ or \ \ \ 5z =-22\ \ / :5\\\\ z =4 \ \ \ or \ \ \ z =-\frac{22}{5}=-4.4[/tex]
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