x 2 −4x−16=−4x

The equation you provided is "x^2 - 4x - 16 = -4x".

Step 1: Simplify the equation by moving all terms to one side.

x^2 - 4x + 4x - 16 = 0

This simplifies to:

x^2 - 16 = 0

Step 2: Solve for x by adding 16 to both sides of the equation.

x^2 = 16

Step 3: Take the square root of both sides. Remember that the square root of a number y is both the positive and negative number that, when squared, gives y.

x = sqrt(16)

So, x = 4 and x = -4 are the solutions to the equation.