x=.1x^2-.5x+1.4

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Solution for x=.1x^2-.5x+1.4 equation:


Simplifying
x = 0.1x2 + -0.5x + 1.4

Reorder the terms:
x = 1.4 + -0.5x + 0.1x2

Solving
x = 1.4 + -0.5x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
-1.4 + x + 0.5x + -0.1x2 = 1.4 + -0.5x + 0.1x2 + -1.4 + 0.5x + -0.1x2

Combine like terms: x + 0.5x = 1.5x
-1.4 + 1.5x + -0.1x2 = 1.4 + -0.5x + 0.1x2 + -1.4 + 0.5x + -0.1x2

Reorder the terms:
-1.4 + 1.5x + -0.1x2 = 1.4 + -1.4 + -0.5x + 0.5x + 0.1x2 + -0.1x2

Combine like terms: 1.4 + -1.4 = 0.0
-1.4 + 1.5x + -0.1x2 = 0.0 + -0.5x + 0.5x + 0.1x2 + -0.1x2
-1.4 + 1.5x + -0.1x2 = -0.5x + 0.5x + 0.1x2 + -0.1x2

Combine like terms: -0.5x + 0.5x = 0.0
-1.4 + 1.5x + -0.1x2 = 0.0 + 0.1x2 + -0.1x2
-1.4 + 1.5x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
-1.4 + 1.5x + -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 + -15x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -15x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + -15x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -15x + x2 = 0 + -14
-15x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
-15x + x2 = -14

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -14 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -14 + 56.25

Combine like terms: -14 + 56.25 = 42.25
56.25 + -15x + x2 = 42.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 42.25

Calculate the square root of the right side: 6.5

Break this problem into two subproblems by setting 
(x + -7.5) equal to 6.5 and -6.5.

Subproblem 1

x + -7.5 = 6.5 Simplifying x + -7.5 = 6.5 Reorder the terms: -7.5 + x = 6.5 Solving -7.5 + x = 6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 6.5 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 6.5 + 7.5 x = 6.5 + 7.5 Combine like terms: 6.5 + 7.5 = 14 x = 14 Simplifying x = 14

Subproblem 2

x + -7.5 = -6.5 Simplifying x + -7.5 = -6.5 Reorder the terms: -7.5 + x = -6.5 Solving -7.5 + x = -6.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -6.5 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -6.5 + 7.5 x = -6.5 + 7.5 Combine like terms: -6.5 + 7.5 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14, 1}

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