8x^2+40x-11=0

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Solution for 8x^2+40x-11=0 equation:


Simplifying
8x2 + 40x + -11 = 0

Reorder the terms:
-11 + 40x + 8x2 = 0

Solving
-11 + 40x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-1.375 + 5x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + 5x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + 5x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + 5x + x2 = 0 + 1.375
5x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
5x + x2 = 1.375

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 1.375 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 1.375 + 6.25

Combine like terms: 1.375 + 6.25 = 7.625
6.25 + 5x + x2 = 7.625

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 7.625

Calculate the square root of the right side: 2.761340254

Break this problem into two subproblems by setting 
(x + 2.5) equal to 2.761340254 and -2.761340254.

Subproblem 1

x + 2.5 = 2.761340254 Simplifying x + 2.5 = 2.761340254 Reorder the terms: 2.5 + x = 2.761340254 Solving 2.5 + x = 2.761340254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 2.761340254 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 2.761340254 + -2.5 x = 2.761340254 + -2.5 Combine like terms: 2.761340254 + -2.5 = 0.261340254 x = 0.261340254 Simplifying x = 0.261340254

Subproblem 2

x + 2.5 = -2.761340254 Simplifying x + 2.5 = -2.761340254 Reorder the terms: 2.5 + x = -2.761340254 Solving 2.5 + x = -2.761340254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -2.761340254 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -2.761340254 + -2.5 x = -2.761340254 + -2.5 Combine like terms: -2.761340254 + -2.5 = -5.261340254 x = -5.261340254 Simplifying x = -5.261340254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.261340254, -5.261340254}

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