(7a+2)(7a-2)=

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

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

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

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

Multiply (2 + 7a) * (-2 + 7a)
(2(-2 + 7a) + 7a * (-2 + 7a)) = 0
((-2 * 2 + 7a * 2) + 7a * (-2 + 7a)) = 0
((-4 + 14a) + 7a * (-2 + 7a)) = 0
(-4 + 14a + (-2 * 7a + 7a * 7a)) = 0
(-4 + 14a + (-14a + 49a2)) = 0

Combine like terms: 14a + -14a = 0
(-4 + 0 + 49a2) = 0
(-4 + 49a2) = 0

Solving
-4 + 49a2 = 0

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 49a2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 49a2 = 0 + 4
49a2 = 0 + 4

Combine like terms: 0 + 4 = 4
49a2 = 4

Divide each side by '49'.
a2 = 0.08163265306

Simplifying
a2 = 0.08163265306

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