8x^2+15x-175=0

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Solution for 8x^2+15x-175=0 equation:


Simplifying
8x2 + 15x + -175 = 0

Reorder the terms:
-175 + 15x + 8x2 = 0

Solving
-175 + 15x + 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'.
-21.875 + 1.875x + x2 = 0

Move the constant term to the right:

Add '21.875' to each side of the equation.
-21.875 + 1.875x + 21.875 + x2 = 0 + 21.875

Reorder the terms:
-21.875 + 21.875 + 1.875x + x2 = 0 + 21.875

Combine like terms: -21.875 + 21.875 = 0.000
0.000 + 1.875x + x2 = 0 + 21.875
1.875x + x2 = 0 + 21.875

Combine like terms: 0 + 21.875 = 21.875
1.875x + x2 = 21.875

The x term is 1.875x.  Take half its coefficient (0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
1.875x + 0.87890625 + x2 = 21.875 + 0.87890625

Reorder the terms:
0.87890625 + 1.875x + x2 = 21.875 + 0.87890625

Combine like terms: 21.875 + 0.87890625 = 22.75390625
0.87890625 + 1.875x + x2 = 22.75390625

Factor a perfect square on the left side:
(x + 0.9375)(x + 0.9375) = 22.75390625

Calculate the square root of the right side: 4.770105476

Break this problem into two subproblems by setting 
(x + 0.9375) equal to 4.770105476 and -4.770105476.

Subproblem 1

x + 0.9375 = 4.770105476 Simplifying x + 0.9375 = 4.770105476 Reorder the terms: 0.9375 + x = 4.770105476 Solving 0.9375 + x = 4.770105476 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9375' to each side of the equation. 0.9375 + -0.9375 + x = 4.770105476 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + x = 4.770105476 + -0.9375 x = 4.770105476 + -0.9375 Combine like terms: 4.770105476 + -0.9375 = 3.832605476 x = 3.832605476 Simplifying x = 3.832605476

Subproblem 2

x + 0.9375 = -4.770105476 Simplifying x + 0.9375 = -4.770105476 Reorder the terms: 0.9375 + x = -4.770105476 Solving 0.9375 + x = -4.770105476 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9375' to each side of the equation. 0.9375 + -0.9375 + x = -4.770105476 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + x = -4.770105476 + -0.9375 x = -4.770105476 + -0.9375 Combine like terms: -4.770105476 + -0.9375 = -5.707605476 x = -5.707605476 Simplifying x = -5.707605476

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.832605476, -5.707605476}

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