x^2-1.4x=.51

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Solution for x^2-1.4x=.51 equation: 


Simplifying
x2 + -1.4x = 0.51

Reorder the terms:
-1.4x + x2 = 0.51

Solving
-1.4x + x2 = 0.51

Solving for variable 'x'.

Reorder the terms:
-0.51 + -1.4x + x2 = 0.51 + -0.51

Combine like terms: 0.51 + -0.51 = 0.00
-0.51 + -1.4x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.51' to each side of the equation.
-0.51 + -1.4x + 0.51 + x2 = 0.00 + 0.51

Reorder the terms:
-0.51 + 0.51 + -1.4x + x2 = 0.00 + 0.51

Combine like terms: -0.51 + 0.51 = 0.00
0.00 + -1.4x + x2 = 0.00 + 0.51
-1.4x + x2 = 0.00 + 0.51

Combine like terms: 0.00 + 0.51 = 0.51
-1.4x + x2 = 0.51

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 0.51 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 0.51 + 0.49

Combine like terms: 0.51 + 0.49 = 1
0.49 + -1.4x + x2 = 1

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + -0.7) equal to 1 and -1.


Subproblem 1
x + -0.7 = 1

Simplifying
x + -0.7 = 1

Reorder the terms:
-0.7 + x = 1

Solving
-0.7 + x = 1

Solving for variable 'x'.

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

Add '0.7' to each side of the equation.
-0.7 + 0.7 + x = 1 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + x = 1 + 0.7
x = 1 + 0.7

Combine like terms: 1 + 0.7 = 1.7
x = 1.7

Simplifying
x = 1.7


Subproblem 2
x + -0.7 = -1

Simplifying
x + -0.7 = -1

Reorder the terms:
-0.7 + x = -1

Solving
-0.7 + x = -1

Solving for variable 'x'.

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

Add '0.7' to each side of the equation.
-0.7 + 0.7 + x = -1 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + x = -1 + 0.7
x = -1 + 0.7

Combine like terms: -1 + 0.7 = -0.3
x = -0.3

Simplifying
x = -0.3


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.7, -0.3}

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