Answer:
C
Step-by-step explanation:
The steps to solving the equation would be the simple. The previous step would:
[tex](2\cdot{x}+4)^2=28[/tex]
If we multiply the brackets:
[tex]4\cdot{x^2}+16\cdot{x}+16=28[/tex]
[tex]4\cdot{x^2}+16\cdot{x}=28-16[/tex]
[tex]4\cdot{x^2}+16\cdot{x}=12[/tex]
[tex]4\cdot{x^2}=-16\cdot{x}+12[/tex]
We dividing the whole equation by 4:
[tex]x^2=-4\cdot{x}+3[/tex]
The answer is C
