0.2x^2-0.6x+1.5=x

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Solution for 0.2x^2-0.6x+1.5=x equation:


Simplifying
0.2x2 + -0.6x + 1.5 = x

Reorder the terms:
1.5 + -0.6x + 0.2x2 = x

Solving
1.5 + -0.6x + 0.2x2 = x

Solving for variable 'x'.

Reorder the terms:
1.5 + -0.6x + -1x + 0.2x2 = x + -1x

Combine like terms: -0.6x + -1x = -1.6x
1.5 + -1.6x + 0.2x2 = x + -1x

Combine like terms: x + -1x = 0
1.5 + -1.6x + 0.2x2 = 0

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

Divide each side by '0.2'.
7.5 + -8x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -8x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -8x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -8x + x2 = 0 + -7.5
-8x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-8x + x2 = -7.5

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -7.5 + 16

Reorder the terms:
16 + -8x + x2 = -7.5 + 16

Combine like terms: -7.5 + 16 = 8.5
16 + -8x + x2 = 8.5

Factor a perfect square on the left side:
(x + -4)(x + -4) = 8.5

Calculate the square root of the right side: 2.915475947

Break this problem into two subproblems by setting 
(x + -4) equal to 2.915475947 and -2.915475947.

Subproblem 1

x + -4 = 2.915475947 Simplifying x + -4 = 2.915475947 Reorder the terms: -4 + x = 2.915475947 Solving -4 + x = 2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 2.915475947 + 4 Combine like terms: -4 + 4 = 0 0 + x = 2.915475947 + 4 x = 2.915475947 + 4 Combine like terms: 2.915475947 + 4 = 6.915475947 x = 6.915475947 Simplifying x = 6.915475947

Subproblem 2

x + -4 = -2.915475947 Simplifying x + -4 = -2.915475947 Reorder the terms: -4 + x = -2.915475947 Solving -4 + x = -2.915475947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -2.915475947 + 4 Combine like terms: -4 + 4 = 0 0 + x = -2.915475947 + 4 x = -2.915475947 + 4 Combine like terms: -2.915475947 + 4 = 1.084524053 x = 1.084524053 Simplifying x = 1.084524053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.915475947, 1.084524053}

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