0=5x^2+17x-25

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Solution for 0=5x^2+17x-25 equation:


Simplifying
0 = 5x2 + 17x + -25

Reorder the terms:
0 = -25 + 17x + 5x2

Solving
0 = -25 + 17x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 25 = 25
25 + -17x + -5x2 = -25 + 17x + 5x2 + 25 + -17x + -5x2

Reorder the terms:
25 + -17x + -5x2 = -25 + 25 + 17x + -17x + 5x2 + -5x2

Combine like terms: -25 + 25 = 0
25 + -17x + -5x2 = 0 + 17x + -17x + 5x2 + -5x2
25 + -17x + -5x2 = 17x + -17x + 5x2 + -5x2

Combine like terms: 17x + -17x = 0
25 + -17x + -5x2 = 0 + 5x2 + -5x2
25 + -17x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
25 + -17x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-5 + 3.4x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 3.4x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 3.4x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 3.4x + x2 = 0 + 5
3.4x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
3.4x + x2 = 5

The x term is 3.4x.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4x + 2.89 + x2 = 5 + 2.89

Reorder the terms:
2.89 + 3.4x + x2 = 5 + 2.89

Combine like terms: 5 + 2.89 = 7.89
2.89 + 3.4x + x2 = 7.89

Factor a perfect square on the left side:
(x + 1.7)(x + 1.7) = 7.89

Calculate the square root of the right side: 2.808914381

Break this problem into two subproblems by setting 
(x + 1.7) equal to 2.808914381 and -2.808914381.

Subproblem 1

x + 1.7 = 2.808914381 Simplifying x + 1.7 = 2.808914381 Reorder the terms: 1.7 + x = 2.808914381 Solving 1.7 + x = 2.808914381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = 2.808914381 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = 2.808914381 + -1.7 x = 2.808914381 + -1.7 Combine like terms: 2.808914381 + -1.7 = 1.108914381 x = 1.108914381 Simplifying x = 1.108914381

Subproblem 2

x + 1.7 = -2.808914381 Simplifying x + 1.7 = -2.808914381 Reorder the terms: 1.7 + x = -2.808914381 Solving 1.7 + x = -2.808914381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = -2.808914381 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = -2.808914381 + -1.7 x = -2.808914381 + -1.7 Combine like terms: -2.808914381 + -1.7 = -4.508914381 x = -4.508914381 Simplifying x = -4.508914381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.108914381, -4.508914381}

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