7x^2-308.7x+1577.66=0

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Solution for 7x^2-308.7x+1577.66=0 equation:


Simplifying
7x2 + -308.7x + 1577.66 = 0

Reorder the terms:
1577.66 + -308.7x + 7x2 = 0

Solving
1577.66 + -308.7x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
225.38 + -44.1x + x2 = 0

Move the constant term to the right:

Add '-225.38' to each side of the equation.
225.38 + -44.1x + -225.38 + x2 = 0 + -225.38

Reorder the terms:
225.38 + -225.38 + -44.1x + x2 = 0 + -225.38

Combine like terms: 225.38 + -225.38 = 0.00
0.00 + -44.1x + x2 = 0 + -225.38
-44.1x + x2 = 0 + -225.38

Combine like terms: 0 + -225.38 = -225.38
-44.1x + x2 = -225.38

The x term is -44.1x.  Take half its coefficient (-22.05).
Square it (486.2025) and add it to both sides.

Add '486.2025' to each side of the equation.
-44.1x + 486.2025 + x2 = -225.38 + 486.2025

Reorder the terms:
486.2025 + -44.1x + x2 = -225.38 + 486.2025

Combine like terms: -225.38 + 486.2025 = 260.8225
486.2025 + -44.1x + x2 = 260.8225

Factor a perfect square on the left side:
(x + -22.05)(x + -22.05) = 260.8225

Calculate the square root of the right side: 16.15

Break this problem into two subproblems by setting 
(x + -22.05) equal to 16.15 and -16.15.

Subproblem 1

x + -22.05 = 16.15 Simplifying x + -22.05 = 16.15 Reorder the terms: -22.05 + x = 16.15 Solving -22.05 + x = 16.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.05' to each side of the equation. -22.05 + 22.05 + x = 16.15 + 22.05 Combine like terms: -22.05 + 22.05 = 0.00 0.00 + x = 16.15 + 22.05 x = 16.15 + 22.05 Combine like terms: 16.15 + 22.05 = 38.2 x = 38.2 Simplifying x = 38.2

Subproblem 2

x + -22.05 = -16.15 Simplifying x + -22.05 = -16.15 Reorder the terms: -22.05 + x = -16.15 Solving -22.05 + x = -16.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.05' to each side of the equation. -22.05 + 22.05 + x = -16.15 + 22.05 Combine like terms: -22.05 + 22.05 = 0.00 0.00 + x = -16.15 + 22.05 x = -16.15 + 22.05 Combine like terms: -16.15 + 22.05 = 5.9 x = 5.9 Simplifying x = 5.9

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.2, 5.9}

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