5x^2-x-25=0

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


Simplifying
5x2 + -1x + -25 = 0

Reorder the terms:
-25 + -1x + 5x2 = 0

Solving
-25 + -1x + 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 + -0.2x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.2x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.2x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.2x + x2 = 0 + 5
-0.2x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.2x + x2 = 5

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 5 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 5 + 0.01

Combine like terms: 5 + 0.01 = 5.01
0.01 + -0.2x + x2 = 5.01

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 5.01

Calculate the square root of the right side: 2.238302929

Break this problem into two subproblems by setting 
(x + -0.1) equal to 2.238302929 and -2.238302929.

Subproblem 1

x + -0.1 = 2.238302929 Simplifying x + -0.1 = 2.238302929 Reorder the terms: -0.1 + x = 2.238302929 Solving -0.1 + x = 2.238302929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 2.238302929 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 2.238302929 + 0.1 x = 2.238302929 + 0.1 Combine like terms: 2.238302929 + 0.1 = 2.338302929 x = 2.338302929 Simplifying x = 2.338302929

Subproblem 2

x + -0.1 = -2.238302929 Simplifying x + -0.1 = -2.238302929 Reorder the terms: -0.1 + x = -2.238302929 Solving -0.1 + x = -2.238302929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -2.238302929 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -2.238302929 + 0.1 x = -2.238302929 + 0.1 Combine like terms: -2.238302929 + 0.1 = -2.138302929 x = -2.138302929 Simplifying x = -2.138302929

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.338302929, -2.138302929}

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