0.7x^2-1.4-0.7=0

Solution for 0.7x^2-1.4-0.7=0 equation:

Simplifying
0.7x2 + -1.4 + -0.7 = 0

Reorder the terms:
-1.4 + -0.7 + 0.7x2 = 0

Combine like terms: -1.4 + -0.7 = -2.1
-2.1 + 0.7x2 = 0

Solving
-2.1 + 0.7x2 = 0

Solving for variable 'x'.

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

Add '2.1' to each side of the equation.
-2.1 + 2.1 + 0.7x2 = 0 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + 0.7x2 = 0 + 2.1
0.7x2 = 0 + 2.1

Combine like terms: 0 + 2.1 = 2.1
0.7x2 = 2.1

Divide each side by '0.7'.
x2 = 3

Simplifying
x2 = 3

Take the square root of each side:
x = {-1.732050808, 1.732050808}