x^2+0.65=1.8x

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Solution for x^2+0.65=1.8x equation:


Simplifying
x2 + 0.65 = 1.8x

Reorder the terms:
0.65 + x2 = 1.8x

Solving
0.65 + x2 = 1.8x

Solving for variable 'x'.

Reorder the terms:
0.65 + -1.8x + x2 = 1.8x + -1.8x

Combine like terms: 1.8x + -1.8x = 0.0
0.65 + -1.8x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '-0.65' to each side of the equation.
0.65 + -1.8x + -0.65 + x2 = 0.0 + -0.65

Reorder the terms:
0.65 + -0.65 + -1.8x + x2 = 0.0 + -0.65

Combine like terms: 0.65 + -0.65 = 0.00
0.00 + -1.8x + x2 = 0.0 + -0.65
-1.8x + x2 = 0.0 + -0.65

Combine like terms: 0.0 + -0.65 = -0.65
-1.8x + x2 = -0.65

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = -0.65 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = -0.65 + 0.81

Combine like terms: -0.65 + 0.81 = 0.16
0.81 + -1.8x + x2 = 0.16

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 0.16

Calculate the square root of the right side: 0.4

Break this problem into two subproblems by setting 
(x + -0.9) equal to 0.4 and -0.4.

Subproblem 1

x + -0.9 = 0.4 Simplifying x + -0.9 = 0.4 Reorder the terms: -0.9 + x = 0.4 Solving -0.9 + x = 0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 0.4 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 0.4 + 0.9 x = 0.4 + 0.9 Combine like terms: 0.4 + 0.9 = 1.3 x = 1.3 Simplifying x = 1.3

Subproblem 2

x + -0.9 = -0.4 Simplifying x + -0.9 = -0.4 Reorder the terms: -0.9 + x = -0.4 Solving -0.9 + x = -0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -0.4 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -0.4 + 0.9 x = -0.4 + 0.9 Combine like terms: -0.4 + 0.9 = 0.5 x = 0.5 Simplifying x = 0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3, 0.5}

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