5x^2-8x-675=0

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Solution for 5x^2-8x-675=0 equation:


Simplifying
5x2 + -8x + -675 = 0

Reorder the terms:
-675 + -8x + 5x2 = 0

Solving
-675 + -8x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-135 + -1.6x + x2 = 0

Move the constant term to the right:

Add '135' to each side of the equation.
-135 + -1.6x + 135 + x2 = 0 + 135

Reorder the terms:
-135 + 135 + -1.6x + x2 = 0 + 135

Combine like terms: -135 + 135 = 0
0 + -1.6x + x2 = 0 + 135
-1.6x + x2 = 0 + 135

Combine like terms: 0 + 135 = 135
-1.6x + x2 = 135

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 135 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 135 + 0.64

Combine like terms: 135 + 0.64 = 135.64
0.64 + -1.6x + x2 = 135.64

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 135.64

Calculate the square root of the right side: 11.646458689

Break this problem into two subproblems by setting 
(x + -0.8) equal to 11.646458689 and -11.646458689.

Subproblem 1

x + -0.8 = 11.646458689 Simplifying x + -0.8 = 11.646458689 Reorder the terms: -0.8 + x = 11.646458689 Solving -0.8 + x = 11.646458689 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 11.646458689 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 11.646458689 + 0.8 x = 11.646458689 + 0.8 Combine like terms: 11.646458689 + 0.8 = 12.446458689 x = 12.446458689 Simplifying x = 12.446458689

Subproblem 2

x + -0.8 = -11.646458689 Simplifying x + -0.8 = -11.646458689 Reorder the terms: -0.8 + x = -11.646458689 Solving -0.8 + x = -11.646458689 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -11.646458689 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -11.646458689 + 0.8 x = -11.646458689 + 0.8 Combine like terms: -11.646458689 + 0.8 = -10.846458689 x = -10.846458689 Simplifying x = -10.846458689

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.446458689, -10.846458689}

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