$4x \times 1-{\left( -2 \right)}^{2}=4$
Any expression multiplied by $1$ remains the same$4x-{\left( -2 \right)}^{2}=4$
Evaluate the power$4x-4=4$
Move the constant to the right-hand side and change its sign$4x=4+4$
Add the numbers$4x=8$
Divide both sides of the equation by $4$$x=2$