(5-7r)(5+7r)=

Solution for (5-7r)(5+7r)= equation:

Simplifying
(5 + -7r)(5 + 7r) = 0

Multiply (5 + -7r) * (5 + 7r)
(5(5 + 7r) + -7r * (5 + 7r)) = 0
((5 * 5 + 7r * 5) + -7r * (5 + 7r)) = 0
((25 + 35r) + -7r * (5 + 7r)) = 0
(25 + 35r + (5 * -7r + 7r * -7r)) = 0
(25 + 35r + (-35r + -49r2)) = 0

Combine like terms: 35r + -35r = 0
(25 + 0 + -49r2) = 0
(25 + -49r2) = 0

Solving
25 + -49r2 = 0

Solving for variable 'r'.

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

Add '-25' to each side of the equation.
25 + -25 + -49r2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -49r2 = 0 + -25
-49r2 = 0 + -25

Combine like terms: 0 + -25 = -25
-49r2 = -25

Divide each side by '-49'.
r2 = 0.5102040816

Simplifying
r2 = 0.5102040816

Take the square root of each side:
r = {-0.714285714, 0.714285714}