826=1.7x^2+6x+26

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Solution for 826=1.7x^2+6x+26 equation:


Simplifying
826 = 1.7x2 + 6x + 26

Reorder the terms:
826 = 26 + 6x + 1.7x2

Solving
826 = 26 + 6x + 1.7x2

Solving for variable 'x'.

Combine like terms: 826 + -26 = 800
800 + -6x + -1.7x2 = 26 + 6x + 1.7x2 + -26 + -6x + -1.7x2

Reorder the terms:
800 + -6x + -1.7x2 = 26 + -26 + 6x + -6x + 1.7x2 + -1.7x2

Combine like terms: 26 + -26 = 0
800 + -6x + -1.7x2 = 0 + 6x + -6x + 1.7x2 + -1.7x2
800 + -6x + -1.7x2 = 6x + -6x + 1.7x2 + -1.7x2

Combine like terms: 6x + -6x = 0
800 + -6x + -1.7x2 = 0 + 1.7x2 + -1.7x2
800 + -6x + -1.7x2 = 1.7x2 + -1.7x2

Combine like terms: 1.7x2 + -1.7x2 = 0.0
800 + -6x + -1.7x2 = 0.0

Begin completing the square.  Divide all terms by
-1.7 the coefficient of the squared term: 

Divide each side by '-1.7'.
-470.5882353 + 3.529411765x + x2 = 0

Move the constant term to the right:

Add '470.5882353' to each side of the equation.
-470.5882353 + 3.529411765x + 470.5882353 + x2 = 0 + 470.5882353

Reorder the terms:
-470.5882353 + 470.5882353 + 3.529411765x + x2 = 0 + 470.5882353

Combine like terms: -470.5882353 + 470.5882353 = 0.0000000
0.0000000 + 3.529411765x + x2 = 0 + 470.5882353
3.529411765x + x2 = 0 + 470.5882353

Combine like terms: 0 + 470.5882353 = 470.5882353
3.529411765x + x2 = 470.5882353

The x term is 3.529411765x.  Take half its coefficient (1.764705883).
Square it (3.114186853) and add it to both sides.

Add '3.114186853' to each side of the equation.
3.529411765x + 3.114186853 + x2 = 470.5882353 + 3.114186853

Reorder the terms:
3.114186853 + 3.529411765x + x2 = 470.5882353 + 3.114186853

Combine like terms: 470.5882353 + 3.114186853 = 473.702422153
3.114186853 + 3.529411765x + x2 = 473.702422153

Factor a perfect square on the left side:
(x + 1.764705883)(x + 1.764705883) = 473.702422153

Calculate the square root of the right side: 21.764705883

Break this problem into two subproblems by setting 
(x + 1.764705883) equal to 21.764705883 and -21.764705883.

Subproblem 1

x + 1.764705883 = 21.764705883 Simplifying x + 1.764705883 = 21.764705883 Reorder the terms: 1.764705883 + x = 21.764705883 Solving 1.764705883 + x = 21.764705883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.764705883' to each side of the equation. 1.764705883 + -1.764705883 + x = 21.764705883 + -1.764705883 Combine like terms: 1.764705883 + -1.764705883 = 0.000000000 0.000000000 + x = 21.764705883 + -1.764705883 x = 21.764705883 + -1.764705883 Combine like terms: 21.764705883 + -1.764705883 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + 1.764705883 = -21.764705883 Simplifying x + 1.764705883 = -21.764705883 Reorder the terms: 1.764705883 + x = -21.764705883 Solving 1.764705883 + x = -21.764705883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.764705883' to each side of the equation. 1.764705883 + -1.764705883 + x = -21.764705883 + -1.764705883 Combine like terms: 1.764705883 + -1.764705883 = 0.000000000 0.000000000 + x = -21.764705883 + -1.764705883 x = -21.764705883 + -1.764705883 Combine like terms: -21.764705883 + -1.764705883 = -23.529411766 x = -23.529411766 Simplifying x = -23.529411766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -23.529411766}

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