344.35=8x^2-20x

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Solution for 344.35=8x^2-20x equation:


Simplifying
344.35 = 8x2 + -20x

Reorder the terms:
344.35 = -20x + 8x2

Solving
344.35 = -20x + 8x2

Solving for variable 'x'.

Reorder the terms:
344.35 + 20x + -8x2 = -20x + 20x + 8x2 + -8x2

Combine like terms: -20x + 20x = 0
344.35 + 20x + -8x2 = 0 + 8x2 + -8x2
344.35 + 20x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
344.35 + 20x + -8x2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-43.04375 + -2.5x + x2 = 0

Move the constant term to the right:

Add '43.04375' to each side of the equation.
-43.04375 + -2.5x + 43.04375 + x2 = 0 + 43.04375

Reorder the terms:
-43.04375 + 43.04375 + -2.5x + x2 = 0 + 43.04375

Combine like terms: -43.04375 + 43.04375 = 0.00000
0.00000 + -2.5x + x2 = 0 + 43.04375
-2.5x + x2 = 0 + 43.04375

Combine like terms: 0 + 43.04375 = 43.04375
-2.5x + x2 = 43.04375

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 43.04375 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 43.04375 + 1.5625

Combine like terms: 43.04375 + 1.5625 = 44.60625
1.5625 + -2.5x + x2 = 44.60625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 44.60625

Calculate the square root of the right side: 6.678791058

Break this problem into two subproblems by setting 
(x + -1.25) equal to 6.678791058 and -6.678791058.

Subproblem 1

x + -1.25 = 6.678791058 Simplifying x + -1.25 = 6.678791058 Reorder the terms: -1.25 + x = 6.678791058 Solving -1.25 + x = 6.678791058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 6.678791058 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 6.678791058 + 1.25 x = 6.678791058 + 1.25 Combine like terms: 6.678791058 + 1.25 = 7.928791058 x = 7.928791058 Simplifying x = 7.928791058

Subproblem 2

x + -1.25 = -6.678791058 Simplifying x + -1.25 = -6.678791058 Reorder the terms: -1.25 + x = -6.678791058 Solving -1.25 + x = -6.678791058 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -6.678791058 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -6.678791058 + 1.25 x = -6.678791058 + 1.25 Combine like terms: -6.678791058 + 1.25 = -5.428791058 x = -5.428791058 Simplifying x = -5.428791058

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.928791058, -5.428791058}

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