Mathematics

Milagros Guerrero

9 August, 13:06

Brianna's teacher asks her which of these three expressions are equivalent to each other.

Expression A:

9

x

-

3

x

-

4

Expression B:

12

x

-

4

Expression C:

5

x

+

x

-

4

Brianna says that all three expressions are equivalent because the value of each one is

-

4

when

x

=

0

.

Brianna's thinking is incorrect.

+3

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