x=0.1x^2+.7x-1.4

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Solution for x=0.1x^2+.7x-1.4 equation:


Simplifying
x = 0.1x2 + 0.7x + -1.4

Reorder the terms:
x = -1.4 + 0.7x + 0.1x2

Solving
x = -1.4 + 0.7x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
1.4 + x + -0.7x + -0.1x2 = -1.4 + 0.7x + 0.1x2 + 1.4 + -0.7x + -0.1x2

Combine like terms: x + -0.7x = 0.3x
1.4 + 0.3x + -0.1x2 = -1.4 + 0.7x + 0.1x2 + 1.4 + -0.7x + -0.1x2

Reorder the terms:
1.4 + 0.3x + -0.1x2 = -1.4 + 1.4 + 0.7x + -0.7x + 0.1x2 + -0.1x2

Combine like terms: -1.4 + 1.4 = 0.0
1.4 + 0.3x + -0.1x2 = 0.0 + 0.7x + -0.7x + 0.1x2 + -0.1x2
1.4 + 0.3x + -0.1x2 = 0.7x + -0.7x + 0.1x2 + -0.1x2

Combine like terms: 0.7x + -0.7x = 0.0
1.4 + 0.3x + -0.1x2 = 0.0 + 0.1x2 + -0.1x2
1.4 + 0.3x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
1.4 + 0.3x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
-14 + -3x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -3x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + -3x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -3x + x2 = 0 + 14
-3x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
-3x + x2 = 14

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 14 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 14 + 2.25

Combine like terms: 14 + 2.25 = 16.25
2.25 + -3x + x2 = 16.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -1.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + -1.5 = 4.031128874 Simplifying x + -1.5 = 4.031128874 Reorder the terms: -1.5 + x = 4.031128874 Solving -1.5 + x = 4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 4.031128874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 4.031128874 + 1.5 x = 4.031128874 + 1.5 Combine like terms: 4.031128874 + 1.5 = 5.531128874 x = 5.531128874 Simplifying x = 5.531128874

Subproblem 2

x + -1.5 = -4.031128874 Simplifying x + -1.5 = -4.031128874 Reorder the terms: -1.5 + x = -4.031128874 Solving -1.5 + x = -4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -4.031128874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -4.031128874 + 1.5 x = -4.031128874 + 1.5 Combine like terms: -4.031128874 + 1.5 = -2.531128874 x = -2.531128874 Simplifying x = -2.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.531128874, -2.531128874}

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