(-7r+2)(2+7r)=

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

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

Reorder the terms:
(2 + -7r)(2 + 7r) = 0

Multiply (2 + -7r) * (2 + 7r)
(2(2 + 7r) + -7r * (2 + 7r)) = 0
((2 * 2 + 7r * 2) + -7r * (2 + 7r)) = 0
((4 + 14r) + -7r * (2 + 7r)) = 0
(4 + 14r + (2 * -7r + 7r * -7r)) = 0
(4 + 14r + (-14r + -49r2)) = 0

Combine like terms: 14r + -14r = 0
(4 + 0 + -49r2) = 0
(4 + -49r2) = 0

Solving
4 + -49r2 = 0

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + -49r2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -49r2 = 0 + -4
-49r2 = 0 + -4

Combine like terms: 0 + -4 = -4
-49r2 = -4

Divide each side by '-49'.
r2 = 0.08163265306

Simplifying
r2 = 0.08163265306

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