=(4-x)(4+x)

Solution for =(4-x)(4+x) equation:

Simplifying
0 = (4 + -1x)(4 + x)

Multiply (4 + -1x) * (4 + x)
0 = (4(4 + x) + -1x * (4 + x))
0 = ((4 * 4 + x * 4) + -1x * (4 + x))
0 = ((16 + 4x) + -1x * (4 + x))
0 = (16 + 4x + (4 * -1x + x * -1x))
0 = (16 + 4x + (-4x + -1x2))

Combine like terms: 4x + -4x = 0
0 = (16 + 0 + -1x2)
0 = (16 + -1x2)

Solving
0 = 16 + -1x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add 'x2' to each side of the equation.
0 + x2 = 16 + -1x2 + x2
Remove the zero:
x2 = 16 + -1x2 + x2

Combine like terms: -1x2 + x2 = 0
x2 = 16 + 0
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}