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 = 1.7x
-1.4 + 1.7x + -0.1x2 = 1.4 + -0.7x + 0.1x2 + -1.4 + 0.7x + -0.1x2

Reorder the terms:
-1.4 + 1.7x + -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 + 1.7x + -0.1x2 = 0.0 + -0.7x + 0.7x + 0.1x2 + -0.1x2
-1.4 + 1.7x + -0.1x2 = -0.7x + 0.7x + 0.1x2 + -0.1x2

Combine like terms: -0.7x + 0.7x = 0.0
-1.4 + 1.7x + -0.1x2 = 0.0 + 0.1x2 + -0.1x2
-1.4 + 1.7x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
-1.4 + 1.7x + -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 + -17x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -17x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + -17x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -17x + x2 = 0 + -14
-17x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
-17x + x2 = -14

The x term is -17x.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17x + 72.25 + x2 = -14 + 72.25

Reorder the terms:
72.25 + -17x + x2 = -14 + 72.25

Combine like terms: -14 + 72.25 = 58.25
72.25 + -17x + x2 = 58.25

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 58.25

Calculate the square root of the right side: 7.632168761

Break this problem into two subproblems by setting 
(x + -8.5) equal to 7.632168761 and -7.632168761.

Subproblem 1

x + -8.5 = 7.632168761 Simplifying x + -8.5 = 7.632168761 Reorder the terms: -8.5 + x = 7.632168761 Solving -8.5 + x = 7.632168761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = 7.632168761 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 7.632168761 + 8.5 x = 7.632168761 + 8.5 Combine like terms: 7.632168761 + 8.5 = 16.132168761 x = 16.132168761 Simplifying x = 16.132168761

Subproblem 2

x + -8.5 = -7.632168761 Simplifying x + -8.5 = -7.632168761 Reorder the terms: -8.5 + x = -7.632168761 Solving -8.5 + x = -7.632168761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = -7.632168761 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -7.632168761 + 8.5 x = -7.632168761 + 8.5 Combine like terms: -7.632168761 + 8.5 = 0.867831239 x = 0.867831239 Simplifying x = 0.867831239

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.132168761, 0.867831239}

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