25x(x+1)=5x+4

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Solution for 25x(x+1)=5x+4 equation:


Simplifying
25x(x + 1) = 5x + 4

Reorder the terms:
25x(1 + x) = 5x + 4
(1 * 25x + x * 25x) = 5x + 4
(25x + 25x2) = 5x + 4

Reorder the terms:
25x + 25x2 = 4 + 5x

Solving
25x + 25x2 = 4 + 5x

Solving for variable 'x'.

Reorder the terms:
-4 + 25x + -5x + 25x2 = 4 + 5x + -4 + -5x

Combine like terms: 25x + -5x = 20x
-4 + 20x + 25x2 = 4 + 5x + -4 + -5x

Reorder the terms:
-4 + 20x + 25x2 = 4 + -4 + 5x + -5x

Combine like terms: 4 + -4 = 0
-4 + 20x + 25x2 = 0 + 5x + -5x
-4 + 20x + 25x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-4 + 20x + 25x2 = 0

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

Divide each side by '25'.
-0.16 + 0.8x + x2 = 0

Move the constant term to the right:

Add '0.16' to each side of the equation.
-0.16 + 0.8x + 0.16 + x2 = 0 + 0.16

Reorder the terms:
-0.16 + 0.16 + 0.8x + x2 = 0 + 0.16

Combine like terms: -0.16 + 0.16 = 0.00
0.00 + 0.8x + x2 = 0 + 0.16
0.8x + x2 = 0 + 0.16

Combine like terms: 0 + 0.16 = 0.16
0.8x + x2 = 0.16

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 = 0.16 + 0.16

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

Combine like terms: 0.16 + 0.16 = 0.32
0.16 + 0.8x + x2 = 0.32

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.32

Calculate the square root of the right side: 0.565685425

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.565685425 and -0.565685425.

Subproblem 1

x + 0.4 = 0.565685425 Simplifying x + 0.4 = 0.565685425 Reorder the terms: 0.4 + x = 0.565685425 Solving 0.4 + x = 0.565685425 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 = 0.565685425 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.565685425 + -0.4 x = 0.565685425 + -0.4 Combine like terms: 0.565685425 + -0.4 = 0.165685425 x = 0.165685425 Simplifying x = 0.165685425

Subproblem 2

x + 0.4 = -0.565685425 Simplifying x + 0.4 = -0.565685425 Reorder the terms: 0.4 + x = -0.565685425 Solving 0.4 + x = -0.565685425 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 = -0.565685425 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.565685425 + -0.4 x = -0.565685425 + -0.4 Combine like terms: -0.565685425 + -0.4 = -0.965685425 x = -0.965685425 Simplifying x = -0.965685425

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.165685425, -0.965685425}

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