Answer:
A. [tex]x = 2\sqrt{3}[/tex] and [tex]- 2 \sqrt{3}[/tex]
Step-by-step explanation:
The equation is:
[tex]12 - x^2 = 0[/tex]
To solve this, move 12 to the right hand side and find its square root:
[tex]12 = x^2\\\\=> x^2 = 12\\\\x = \sqrt{12}[/tex]
The square root of a number has two answers, a negative and a positive number of the same value:
=> [tex]x = 2\sqrt{3}[/tex] and [tex]- 2 \sqrt{3}[/tex]
