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Which expressions are equal to 0 when [tex]$x=-1$[/tex]? Check all that apply.

A. [tex]\frac{4(x+1)}{(4x+5)}[/tex]
B. [tex]\frac{4(x-1)}{(5-4x)}[/tex]
C. [tex]\frac{4(x-(-1))}{(4x+5)}[/tex]
D. [tex]\frac{4(x+(-1))}{(4x+5)}[/tex]
E. [tex]\frac{4(x+1)}{(5-4x)}[/tex]


Sagot :

To determine which expressions are equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex], we will substitute [tex]\( x = -1 \)[/tex] into each expression and simplify.

1. For the expression [tex]\(\frac{4(x+1)}{4x+5}\)[/tex]:
[tex]\[ \frac{4(-1+1)}{4(-1)+5} = \frac{4(0)}{-4+5} = \frac{0}{1} = 0 \][/tex]
So, [tex]\(\frac{4(x+1)}{4x+5}\)[/tex] is equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex].

2. For the expression [tex]\(\frac{4(x-1)}{5-4x}\)[/tex]:
[tex]\[ \frac{4(-1-1)}{5-4(-1)} = \frac{4(-2)}{5+4} = \frac{-8}{9} \neq 0 \][/tex]
So, [tex]\(\frac{4(x-1)}{5-4x}\)[/tex] is not equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex].

3. For the expression [tex]\(\frac{4(x-(-1))}{4x+5}\)[/tex]:
[tex]\[ \frac{4(-1-(-1))}{4(-1)+5} = \frac{4(-1+1)}{-4+5} = \frac{4(0)}{1} = 0 \][/tex]
So, [tex]\(\frac{4(x-(-1))}{4x+5}\)[/tex] is equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex].

4. For the expression [tex]\(\frac{4(x+(-1))}{4x+5}\)[/tex]:
[tex]\[ \frac{4(-1+(-1))}{4(-1)+5} = \frac{4(-2)}{-4+5} = \frac{-8}{1} = -8 \neq 0 \][/tex]
So, [tex]\(\frac{4(x+(-1))}{4x+5}\)[/tex] is not equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex].

5. For the expression [tex]\(\frac{4(x+1)}{5-4x}\)[/tex]:
[tex]\[ \frac{4(-1+1)}{5-4(-1)} = \frac{4(0)}{5+4} = \frac{0}{9} = 0 \][/tex]
So, [tex]\(\frac{4(x+1)}{5-4x}\)[/tex] is equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex].

Summarizing the results, the expressions that are equal to [tex]\(0\)[/tex] when [tex]\( x = -1 \)[/tex] are:
[tex]\[ \frac{4(x+1)}{4x+5}, \quad \frac{4(x-(-1))}{4x+5}, \quad \text{and} \quad \frac{4(x+1)}{5-4x} \][/tex]