First, add color(red)(16) to each side of the equation to isolate the x^2 term while keeping the equation balanced:
4x^2 - 16 + color(red)(16) = 28 + color(red)(16)
4x^2 - 0 = 44
4x^2 = 44
Next, divide each side of the equation by color(red)(4) to isolate x^2 while keeping the equation balanced:
(4x^2)/color(red)(4) = 44/color(red)(4)
(color(red)(cancel(color(black)(4)))x^2)/cancel(color(red)(4)) = 11
x^2 = 11
Now, take the square root of each side of the equation to solve for x while keeping the equation balanced. Remember, when taking the square root there is a positive and negative solution:
sqrt(x^2) = +-sqrt(11)
x = +-sqrt(11) = +-3.317 rounded to the nearest thousandth.
