8x^2-35x-40=0

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Solution for 8x^2-35x-40=0 equation:


Simplifying
8x2 + -35x + -40 = 0

Reorder the terms:
-40 + -35x + 8x2 = 0

Solving
-40 + -35x + 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'.
-5 + -4.375x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -4.375x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -4.375x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -4.375x + x2 = 0 + 5
-4.375x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-4.375x + x2 = 5

The x term is -4.375x.  Take half its coefficient (-2.1875).
Square it (4.78515625) and add it to both sides.

Add '4.78515625' to each side of the equation.
-4.375x + 4.78515625 + x2 = 5 + 4.78515625

Reorder the terms:
4.78515625 + -4.375x + x2 = 5 + 4.78515625

Combine like terms: 5 + 4.78515625 = 9.78515625
4.78515625 + -4.375x + x2 = 9.78515625

Factor a perfect square on the left side:
(x + -2.1875)(x + -2.1875) = 9.78515625

Calculate the square root of the right side: 3.128123439

Break this problem into two subproblems by setting 
(x + -2.1875) equal to 3.128123439 and -3.128123439.

Subproblem 1

x + -2.1875 = 3.128123439 Simplifying x + -2.1875 = 3.128123439 Reorder the terms: -2.1875 + x = 3.128123439 Solving -2.1875 + x = 3.128123439 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = 3.128123439 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = 3.128123439 + 2.1875 x = 3.128123439 + 2.1875 Combine like terms: 3.128123439 + 2.1875 = 5.315623439 x = 5.315623439 Simplifying x = 5.315623439

Subproblem 2

x + -2.1875 = -3.128123439 Simplifying x + -2.1875 = -3.128123439 Reorder the terms: -2.1875 + x = -3.128123439 Solving -2.1875 + x = -3.128123439 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = -3.128123439 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = -3.128123439 + 2.1875 x = -3.128123439 + 2.1875 Combine like terms: -3.128123439 + 2.1875 = -0.940623439 x = -0.940623439 Simplifying x = -0.940623439

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.315623439, -0.940623439}

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