35x^2-69x+20=0

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Solution for 35x^2-69x+20=0 equation:


Simplifying
35x2 + -69x + 20 = 0

Reorder the terms:
20 + -69x + 35x2 = 0

Solving
20 + -69x + 35x2 = 0

Solving for variable 'x'.

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

Divide each side by '35'.
0.5714285714 + -1.971428571x + x2 = 0

Move the constant term to the right:

Add '-0.5714285714' to each side of the equation.
0.5714285714 + -1.971428571x + -0.5714285714 + x2 = 0 + -0.5714285714

Reorder the terms:
0.5714285714 + -0.5714285714 + -1.971428571x + x2 = 0 + -0.5714285714

Combine like terms: 0.5714285714 + -0.5714285714 = 0.0000000000
0.0000000000 + -1.971428571x + x2 = 0 + -0.5714285714
-1.971428571x + x2 = 0 + -0.5714285714

Combine like terms: 0 + -0.5714285714 = -0.5714285714
-1.971428571x + x2 = -0.5714285714

The x term is -1.971428571x.  Take half its coefficient (-0.9857142855).
Square it (0.9716326526) and add it to both sides.

Add '0.9716326526' to each side of the equation.
-1.971428571x + 0.9716326526 + x2 = -0.5714285714 + 0.9716326526

Reorder the terms:
0.9716326526 + -1.971428571x + x2 = -0.5714285714 + 0.9716326526

Combine like terms: -0.5714285714 + 0.9716326526 = 0.4002040812
0.9716326526 + -1.971428571x + x2 = 0.4002040812

Factor a perfect square on the left side:
(x + -0.9857142855)(x + -0.9857142855) = 0.4002040812

Calculate the square root of the right side: 0.632616852

Break this problem into two subproblems by setting 
(x + -0.9857142855) equal to 0.632616852 and -0.632616852.

Subproblem 1

x + -0.9857142855 = 0.632616852 Simplifying x + -0.9857142855 = 0.632616852 Reorder the terms: -0.9857142855 + x = 0.632616852 Solving -0.9857142855 + x = 0.632616852 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9857142855' to each side of the equation. -0.9857142855 + 0.9857142855 + x = 0.632616852 + 0.9857142855 Combine like terms: -0.9857142855 + 0.9857142855 = 0.0000000000 0.0000000000 + x = 0.632616852 + 0.9857142855 x = 0.632616852 + 0.9857142855 Combine like terms: 0.632616852 + 0.9857142855 = 1.6183311375 x = 1.6183311375 Simplifying x = 1.6183311375

Subproblem 2

x + -0.9857142855 = -0.632616852 Simplifying x + -0.9857142855 = -0.632616852 Reorder the terms: -0.9857142855 + x = -0.632616852 Solving -0.9857142855 + x = -0.632616852 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9857142855' to each side of the equation. -0.9857142855 + 0.9857142855 + x = -0.632616852 + 0.9857142855 Combine like terms: -0.9857142855 + 0.9857142855 = 0.0000000000 0.0000000000 + x = -0.632616852 + 0.9857142855 x = -0.632616852 + 0.9857142855 Combine like terms: -0.632616852 + 0.9857142855 = 0.3530974335 x = 0.3530974335 Simplifying x = 0.3530974335

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6183311375, 0.3530974335}

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