The error made can be corrected by: D. using the square root property of equality, square both sides of the equation and not just one variable.
What is the Square Root Property of Equality?
To move the square of a number on one side of an equation, the square root property of equality is applied by squaring all the terms on each side of the equation.
The error in the steps shown was made when applying the square root property of equality because only "k' was squared instead of both "k" and "2".
Therefore, to correct the error: D. using the square root property of equality, square both sides of the equation and not just one variable.
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