25x^2+20x-26=0

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Solution for 25x^2+20x-26=0 equation:


Simplifying
25x2 + 20x + -26 = 0

Reorder the terms:
-26 + 20x + 25x2 = 0

Solving
-26 + 20x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
-1.04 + 0.8x + x2 = 0

Move the constant term to the right:

Add '1.04' to each side of the equation.
-1.04 + 0.8x + 1.04 + x2 = 0 + 1.04

Reorder the terms:
-1.04 + 1.04 + 0.8x + x2 = 0 + 1.04

Combine like terms: -1.04 + 1.04 = 0.00
0.00 + 0.8x + x2 = 0 + 1.04
0.8x + x2 = 0 + 1.04

Combine like terms: 0 + 1.04 = 1.04
0.8x + x2 = 1.04

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 1.04 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 1.04 + 0.16

Combine like terms: 1.04 + 0.16 = 1.2
0.16 + 0.8x + x2 = 1.2

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 1.2

Calculate the square root of the right side: 1.095445115

Break this problem into two subproblems by setting 
(x + 0.4) equal to 1.095445115 and -1.095445115.

Subproblem 1

x + 0.4 = 1.095445115 Simplifying x + 0.4 = 1.095445115 Reorder the terms: 0.4 + x = 1.095445115 Solving 0.4 + x = 1.095445115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 1.095445115 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 1.095445115 + -0.4 x = 1.095445115 + -0.4 Combine like terms: 1.095445115 + -0.4 = 0.695445115 x = 0.695445115 Simplifying x = 0.695445115

Subproblem 2

x + 0.4 = -1.095445115 Simplifying x + 0.4 = -1.095445115 Reorder the terms: 0.4 + x = -1.095445115 Solving 0.4 + x = -1.095445115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -1.095445115 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -1.095445115 + -0.4 x = -1.095445115 + -0.4 Combine like terms: -1.095445115 + -0.4 = -1.495445115 x = -1.495445115 Simplifying x = -1.495445115

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.695445115, -1.495445115}

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