5x^2+8x-25=0

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Solution for 5x^2+8x-25=0 equation:


Simplifying
5x2 + 8x + -25 = 0

Reorder the terms:
-25 + 8x + 5x2 = 0

Solving
-25 + 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'.
-5 + 1.6x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 1.6x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 1.6x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 1.6x + x2 = 0 + 5
1.6x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
1.6x + x2 = 5

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 = 5 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 5 + 0.64

Combine like terms: 5 + 0.64 = 5.64
0.64 + 1.6x + x2 = 5.64

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 5.64

Calculate the square root of the right side: 2.374868417

Break this problem into two subproblems by setting 
(x + 0.8) equal to 2.374868417 and -2.374868417.

Subproblem 1

x + 0.8 = 2.374868417 Simplifying x + 0.8 = 2.374868417 Reorder the terms: 0.8 + x = 2.374868417 Solving 0.8 + x = 2.374868417 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 = 2.374868417 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 2.374868417 + -0.8 x = 2.374868417 + -0.8 Combine like terms: 2.374868417 + -0.8 = 1.574868417 x = 1.574868417 Simplifying x = 1.574868417

Subproblem 2

x + 0.8 = -2.374868417 Simplifying x + 0.8 = -2.374868417 Reorder the terms: 0.8 + x = -2.374868417 Solving 0.8 + x = -2.374868417 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 = -2.374868417 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -2.374868417 + -0.8 x = -2.374868417 + -0.8 Combine like terms: -2.374868417 + -0.8 = -3.174868417 x = -3.174868417 Simplifying x = -3.174868417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.574868417, -3.174868417}

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