10x^2+69.44=68.4x

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Solution for 10x^2+69.44=68.4x equation:


Simplifying
10x2 + 69.44 = 68.4x

Reorder the terms:
69.44 + 10x2 = 68.4x

Solving
69.44 + 10x2 = 68.4x

Solving for variable 'x'.

Reorder the terms:
69.44 + -68.4x + 10x2 = 68.4x + -68.4x

Combine like terms: 68.4x + -68.4x = 0.0
69.44 + -68.4x + 10x2 = 0.0

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

Divide each side by '10'.
6.944 + -6.84x + x2 = 0.0

Move the constant term to the right:

Add '-6.944' to each side of the equation.
6.944 + -6.84x + -6.944 + x2 = 0.0 + -6.944

Reorder the terms:
6.944 + -6.944 + -6.84x + x2 = 0.0 + -6.944

Combine like terms: 6.944 + -6.944 = 0.000
0.000 + -6.84x + x2 = 0.0 + -6.944
-6.84x + x2 = 0.0 + -6.944

Combine like terms: 0.0 + -6.944 = -6.944
-6.84x + x2 = -6.944

The x term is -6.84x.  Take half its coefficient (-3.42).
Square it (11.6964) and add it to both sides.

Add '11.6964' to each side of the equation.
-6.84x + 11.6964 + x2 = -6.944 + 11.6964

Reorder the terms:
11.6964 + -6.84x + x2 = -6.944 + 11.6964

Combine like terms: -6.944 + 11.6964 = 4.7524
11.6964 + -6.84x + x2 = 4.7524

Factor a perfect square on the left side:
(x + -3.42)(x + -3.42) = 4.7524

Calculate the square root of the right side: 2.18

Break this problem into two subproblems by setting 
(x + -3.42) equal to 2.18 and -2.18.

Subproblem 1

x + -3.42 = 2.18 Simplifying x + -3.42 = 2.18 Reorder the terms: -3.42 + x = 2.18 Solving -3.42 + x = 2.18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.42' to each side of the equation. -3.42 + 3.42 + x = 2.18 + 3.42 Combine like terms: -3.42 + 3.42 = 0.00 0.00 + x = 2.18 + 3.42 x = 2.18 + 3.42 Combine like terms: 2.18 + 3.42 = 5.6 x = 5.6 Simplifying x = 5.6

Subproblem 2

x + -3.42 = -2.18 Simplifying x + -3.42 = -2.18 Reorder the terms: -3.42 + x = -2.18 Solving -3.42 + x = -2.18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.42' to each side of the equation. -3.42 + 3.42 + x = -2.18 + 3.42 Combine like terms: -3.42 + 3.42 = 0.00 0.00 + x = -2.18 + 3.42 x = -2.18 + 3.42 Combine like terms: -2.18 + 3.42 = 1.24 x = 1.24 Simplifying x = 1.24

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.6, 1.24}

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