0.7x^2=1.4x+.07

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Solution for 0.7x^2=1.4x+.07 equation:


Simplifying
0.7x2 = 1.4x + 0.07

Reorder the terms:
0.7x2 = 0.07 + 1.4x

Solving
0.7x2 = 0.07 + 1.4x

Solving for variable 'x'.

Reorder the terms:
-0.07 + -1.4x + 0.7x2 = 0.07 + 1.4x + -0.07 + -1.4x

Reorder the terms:
-0.07 + -1.4x + 0.7x2 = 0.07 + -0.07 + 1.4x + -1.4x

Combine like terms: 0.07 + -0.07 = 0.00
-0.07 + -1.4x + 0.7x2 = 0.00 + 1.4x + -1.4x
-0.07 + -1.4x + 0.7x2 = 1.4x + -1.4x

Combine like terms: 1.4x + -1.4x = 0.0
-0.07 + -1.4x + 0.7x2 = 0.0

Begin completing the square.  Divide all terms by
0.7 the coefficient of the squared term: 

Divide each side by '0.7'.
-0.1 + -2x + x2 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + -2x + 0.1 + x2 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + -2x + x2 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + -2x + x2 = 0 + 0.1
-2x + x2 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
-2x + x2 = 0.1

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 0.1 + 1

Reorder the terms:
1 + -2x + x2 = 0.1 + 1

Combine like terms: 0.1 + 1 = 1.1
1 + -2x + x2 = 1.1

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.1

Calculate the square root of the right side: 1.048808848

Break this problem into two subproblems by setting 
(x + -1) equal to 1.048808848 and -1.048808848.

Subproblem 1

x + -1 = 1.048808848 Simplifying x + -1 = 1.048808848 Reorder the terms: -1 + x = 1.048808848 Solving -1 + x = 1.048808848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.048808848 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.048808848 + 1 x = 1.048808848 + 1 Combine like terms: 1.048808848 + 1 = 2.048808848 x = 2.048808848 Simplifying x = 2.048808848

Subproblem 2

x + -1 = -1.048808848 Simplifying x + -1 = -1.048808848 Reorder the terms: -1 + x = -1.048808848 Solving -1 + x = -1.048808848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.048808848 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.048808848 + 1 x = -1.048808848 + 1 Combine like terms: -1.048808848 + 1 = -0.048808848 x = -0.048808848 Simplifying x = -0.048808848

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.048808848, -0.048808848}

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