1.8=1+9x-10x^2

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Solution for 1.8=1+9x-10x^2 equation:


Simplifying
1.8 = 1 + 9x + -10x2

Solving
1.8 = 1 + 9x + -10x2

Solving for variable 'x'.

Combine like terms: 1.8 + -1 = 0.8
0.8 + -9x + 10x2 = 1 + 9x + -10x2 + -1 + -9x + 10x2

Reorder the terms:
0.8 + -9x + 10x2 = 1 + -1 + 9x + -9x + -10x2 + 10x2

Combine like terms: 1 + -1 = 0
0.8 + -9x + 10x2 = 0 + 9x + -9x + -10x2 + 10x2
0.8 + -9x + 10x2 = 9x + -9x + -10x2 + 10x2

Combine like terms: 9x + -9x = 0
0.8 + -9x + 10x2 = 0 + -10x2 + 10x2
0.8 + -9x + 10x2 = -10x2 + 10x2

Combine like terms: -10x2 + 10x2 = 0
0.8 + -9x + 10x2 = 0

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

Divide each side by '10'.
0.08 + -0.9x + x2 = 0

Move the constant term to the right:

Add '-0.08' to each side of the equation.
0.08 + -0.9x + -0.08 + x2 = 0 + -0.08

Reorder the terms:
0.08 + -0.08 + -0.9x + x2 = 0 + -0.08

Combine like terms: 0.08 + -0.08 = 0.00
0.00 + -0.9x + x2 = 0 + -0.08
-0.9x + x2 = 0 + -0.08

Combine like terms: 0 + -0.08 = -0.08
-0.9x + x2 = -0.08

The x term is -0.9x.  Take half its coefficient (-0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
-0.9x + 0.2025 + x2 = -0.08 + 0.2025

Reorder the terms:
0.2025 + -0.9x + x2 = -0.08 + 0.2025

Combine like terms: -0.08 + 0.2025 = 0.1225
0.2025 + -0.9x + x2 = 0.1225

Factor a perfect square on the left side:
(x + -0.45)(x + -0.45) = 0.1225

Calculate the square root of the right side: 0.35

Break this problem into two subproblems by setting 
(x + -0.45) equal to 0.35 and -0.35.

Subproblem 1

x + -0.45 = 0.35 Simplifying x + -0.45 = 0.35 Reorder the terms: -0.45 + x = 0.35 Solving -0.45 + x = 0.35 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = 0.35 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = 0.35 + 0.45 x = 0.35 + 0.45 Combine like terms: 0.35 + 0.45 = 0.8 x = 0.8 Simplifying x = 0.8

Subproblem 2

x + -0.45 = -0.35 Simplifying x + -0.45 = -0.35 Reorder the terms: -0.45 + x = -0.35 Solving -0.45 + x = -0.35 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = -0.35 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = -0.35 + 0.45 x = -0.35 + 0.45 Combine like terms: -0.35 + 0.45 = 0.1 x = 0.1 Simplifying x = 0.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8, 0.1}

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