Answer:
The error is in line iii
And the correct solution is;
[tex]4c^2+1=d[/tex]Explanation:
Given the equation;
[tex]c=\frac{1}{2}\sqrt[]{d-1}[/tex]Solving for d, we have;
multiply through by 2 to get;
[tex]2c=\sqrt[]{d-1}[/tex]then we will square both sides;
[tex]\begin{gathered} (2c)^2=d-1 \\ 4c^2=d-1 \end{gathered}[/tex]Adding 1 to both sides;
[tex]4c^2+1=d[/tex]Therefore;
The error is in line iii
And the correct solution is;
[tex]4c^2+1=d[/tex]