x(25x+9)=18

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Solution for x(25x+9)=18 equation:


Simplifying
x(25x + 9) = 18

Reorder the terms:
x(9 + 25x) = 18
(9 * x + 25x * x) = 18
(9x + 25x2) = 18

Solving
9x + 25x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 9x + 25x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 9x + 25x2 = 0

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

Divide each side by '25'.
-0.72 + 0.36x + x2 = 0

Move the constant term to the right:

Add '0.72' to each side of the equation.
-0.72 + 0.36x + 0.72 + x2 = 0 + 0.72

Reorder the terms:
-0.72 + 0.72 + 0.36x + x2 = 0 + 0.72

Combine like terms: -0.72 + 0.72 = 0.00
0.00 + 0.36x + x2 = 0 + 0.72
0.36x + x2 = 0 + 0.72

Combine like terms: 0 + 0.72 = 0.72
0.36x + x2 = 0.72

The x term is 0.36x.  Take half its coefficient (0.18).
Square it (0.0324) and add it to both sides.

Add '0.0324' to each side of the equation.
0.36x + 0.0324 + x2 = 0.72 + 0.0324

Reorder the terms:
0.0324 + 0.36x + x2 = 0.72 + 0.0324

Combine like terms: 0.72 + 0.0324 = 0.7524
0.0324 + 0.36x + x2 = 0.7524

Factor a perfect square on the left side:
(x + 0.18)(x + 0.18) = 0.7524

Calculate the square root of the right side: 0.867409938

Break this problem into two subproblems by setting 
(x + 0.18) equal to 0.867409938 and -0.867409938.

Subproblem 1

x + 0.18 = 0.867409938 Simplifying x + 0.18 = 0.867409938 Reorder the terms: 0.18 + x = 0.867409938 Solving 0.18 + x = 0.867409938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.18' to each side of the equation. 0.18 + -0.18 + x = 0.867409938 + -0.18 Combine like terms: 0.18 + -0.18 = 0.00 0.00 + x = 0.867409938 + -0.18 x = 0.867409938 + -0.18 Combine like terms: 0.867409938 + -0.18 = 0.687409938 x = 0.687409938 Simplifying x = 0.687409938

Subproblem 2

x + 0.18 = -0.867409938 Simplifying x + 0.18 = -0.867409938 Reorder the terms: 0.18 + x = -0.867409938 Solving 0.18 + x = -0.867409938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.18' to each side of the equation. 0.18 + -0.18 + x = -0.867409938 + -0.18 Combine like terms: 0.18 + -0.18 = 0.00 0.00 + x = -0.867409938 + -0.18 x = -0.867409938 + -0.18 Combine like terms: -0.867409938 + -0.18 = -1.047409938 x = -1.047409938 Simplifying x = -1.047409938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.687409938, -1.047409938}

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