8x^2+25x-200=0

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Solution for 8x^2+25x-200=0 equation:


Simplifying
8x2 + 25x + -200 = 0

Reorder the terms:
-200 + 25x + 8x2 = 0

Solving
-200 + 25x + 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'.
-25 + 3.125x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 3.125x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 3.125x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 3.125x + x2 = 0 + 25
3.125x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
3.125x + x2 = 25

The x term is 3.125x.  Take half its coefficient (1.5625).
Square it (2.44140625) and add it to both sides.

Add '2.44140625' to each side of the equation.
3.125x + 2.44140625 + x2 = 25 + 2.44140625

Reorder the terms:
2.44140625 + 3.125x + x2 = 25 + 2.44140625

Combine like terms: 25 + 2.44140625 = 27.44140625
2.44140625 + 3.125x + x2 = 27.44140625

Factor a perfect square on the left side:
(x + 1.5625)(x + 1.5625) = 27.44140625

Calculate the square root of the right side: 5.238454567

Break this problem into two subproblems by setting 
(x + 1.5625) equal to 5.238454567 and -5.238454567.

Subproblem 1

x + 1.5625 = 5.238454567 Simplifying x + 1.5625 = 5.238454567 Reorder the terms: 1.5625 + x = 5.238454567 Solving 1.5625 + x = 5.238454567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + x = 5.238454567 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + x = 5.238454567 + -1.5625 x = 5.238454567 + -1.5625 Combine like terms: 5.238454567 + -1.5625 = 3.675954567 x = 3.675954567 Simplifying x = 3.675954567

Subproblem 2

x + 1.5625 = -5.238454567 Simplifying x + 1.5625 = -5.238454567 Reorder the terms: 1.5625 + x = -5.238454567 Solving 1.5625 + x = -5.238454567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5625' to each side of the equation. 1.5625 + -1.5625 + x = -5.238454567 + -1.5625 Combine like terms: 1.5625 + -1.5625 = 0.0000 0.0000 + x = -5.238454567 + -1.5625 x = -5.238454567 + -1.5625 Combine like terms: -5.238454567 + -1.5625 = -6.800954567 x = -6.800954567 Simplifying x = -6.800954567

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.675954567, -6.800954567}

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