(7x-0.7)(7x+0.7)=0

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Solution for (7x-0.7)(7x+0.7)=0 equation: 


Simplifying
(7x + -0.7)(7x + 0.7) = 0

Reorder the terms:
(-0.7 + 7x)(7x + 0.7) = 0

Reorder the terms:
(-0.7 + 7x)(0.7 + 7x) = 0

Multiply (-0.7 + 7x) * (0.7 + 7x)
(-0.7(0.7 + 7x) + 7x * (0.7 + 7x)) = 0
((0.7 * -0.7 + 7x * -0.7) + 7x * (0.7 + 7x)) = 0
((-0.49 + -4.9x) + 7x * (0.7 + 7x)) = 0
(-0.49 + -4.9x + (0.7 * 7x + 7x * 7x)) = 0
(-0.49 + -4.9x + (4.9x + 49x2)) = 0

Combine like terms: -4.9x + 4.9x = 0.0
(-0.49 + 0.0 + 49x2) = 0
(-0.49 + 49x2) = 0

Solving
-0.49 + 49x2 = 0

Solving for variable 'x'.

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

Add '0.49' to each side of the equation.
-0.49 + 0.49 + 49x2 = 0 + 0.49

Combine like terms: -0.49 + 0.49 = 0.00
0.00 + 49x2 = 0 + 0.49
49x2 = 0 + 0.49

Combine like terms: 0 + 0.49 = 0.49
49x2 = 0.49

Divide each side by '49'.
x2 = 0.01

Simplifying
x2 = 0.01

Take the square root of each side:
x = {-0.1, 0.1}

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