MATH SOLVE

4 months ago

Q:
# which equation are true for x=-2 and x=2 check all that apply

Accepted Solution

A:

1 it is true

[tex] {x}^{2} - 4 = 0 \\ {x}^{2} = + 4 \\ x = \sqrt{4} = 2[/tex]

2 it's not true

[tex] {x}^{2} = - 4 [/tex]

3 it's not true

[tex]3 {x}^{2} + 12 = 0 \\ 3 {x}^{2} = - 12 \\ {x}^{2} = \frac{ - 12}{3} = - 4 \\ [/tex]

4 it's true

[tex]4 {x}^{2} = 16 \\ {x}^{2} = \frac{16}{4} = 4 \\ x = \sqrt{4} = 2[/tex]

5- it's true

[tex] {2(x - 2)}^{2} = 0 \\ {(x - 2)}^{2} = 0 \\ x - 2 = 0 \\ x = 2[/tex]

[tex] {x}^{2} - 4 = 0 \\ {x}^{2} = + 4 \\ x = \sqrt{4} = 2[/tex]

2 it's not true

[tex] {x}^{2} = - 4 [/tex]

3 it's not true

[tex]3 {x}^{2} + 12 = 0 \\ 3 {x}^{2} = - 12 \\ {x}^{2} = \frac{ - 12}{3} = - 4 \\ [/tex]

4 it's true

[tex]4 {x}^{2} = 16 \\ {x}^{2} = \frac{16}{4} = 4 \\ x = \sqrt{4} = 2[/tex]

5- it's true

[tex] {2(x - 2)}^{2} = 0 \\ {(x - 2)}^{2} = 0 \\ x - 2 = 0 \\ x = 2[/tex]