(2-7z)(2+7z)=

Solution for (2-7z)(2+7z)= equation:

Simplifying
(2 + -7z)(2 + 7z) = 0

Multiply (2 + -7z) * (2 + 7z)
(2(2 + 7z) + -7z * (2 + 7z)) = 0
((2 * 2 + 7z * 2) + -7z * (2 + 7z)) = 0
((4 + 14z) + -7z * (2 + 7z)) = 0
(4 + 14z + (2 * -7z + 7z * -7z)) = 0
(4 + 14z + (-14z + -49z2)) = 0

Combine like terms: 14z + -14z = 0
(4 + 0 + -49z2) = 0
(4 + -49z2) = 0

Solving
4 + -49z2 = 0

Solving for variable 'z'.

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

Add '-4' to each side of the equation.
4 + -4 + -49z2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -49z2 = 0 + -4
-49z2 = 0 + -4

Combine like terms: 0 + -4 = -4
-49z2 = -4

Divide each side by '-49'.
z2 = 0.08163265306

Simplifying
z2 = 0.08163265306

Take the square root of each side:
z = {-0.285714286, 0.285714286}