(3x)(3x)+25x-18=

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Solution for (3x)(3x)+25x-18= equation:


Simplifying
(3x)(3x) + 25x + -18 = 0

Remove parenthesis around (3x)
3x(3x) + 25x + -18 = 0

Remove parenthesis around (3x)
3x * 3x + 25x + -18 = 0

Reorder the terms for easier multiplication:
3 * 3x * x + 25x + -18 = 0

Multiply 3 * 3
9x * x + 25x + -18 = 0

Multiply x * x
9x2 + 25x + -18 = 0

Reorder the terms:
-18 + 25x + 9x2 = 0

Solving
-18 + 25x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-2 + 2.777777778x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2.777777778x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 2.777777778x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2.777777778x + x2 = 0 + 2
2.777777778x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
2.777777778x + x2 = 2

The x term is 2.777777778x.  Take half its coefficient (1.388888889).
Square it (1.929012346) and add it to both sides.

Add '1.929012346' to each side of the equation.
2.777777778x + 1.929012346 + x2 = 2 + 1.929012346

Reorder the terms:
1.929012346 + 2.777777778x + x2 = 2 + 1.929012346

Combine like terms: 2 + 1.929012346 = 3.929012346
1.929012346 + 2.777777778x + x2 = 3.929012346

Factor a perfect square on the left side:
(x + 1.388888889)(x + 1.388888889) = 3.929012346

Calculate the square root of the right side: 1.982173642

Break this problem into two subproblems by setting 
(x + 1.388888889) equal to 1.982173642 and -1.982173642.

Subproblem 1

x + 1.388888889 = 1.982173642 Simplifying x + 1.388888889 = 1.982173642 Reorder the terms: 1.388888889 + x = 1.982173642 Solving 1.388888889 + x = 1.982173642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.388888889' to each side of the equation. 1.388888889 + -1.388888889 + x = 1.982173642 + -1.388888889 Combine like terms: 1.388888889 + -1.388888889 = 0.000000000 0.000000000 + x = 1.982173642 + -1.388888889 x = 1.982173642 + -1.388888889 Combine like terms: 1.982173642 + -1.388888889 = 0.593284753 x = 0.593284753 Simplifying x = 0.593284753

Subproblem 2

x + 1.388888889 = -1.982173642 Simplifying x + 1.388888889 = -1.982173642 Reorder the terms: 1.388888889 + x = -1.982173642 Solving 1.388888889 + x = -1.982173642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.388888889' to each side of the equation. 1.388888889 + -1.388888889 + x = -1.982173642 + -1.388888889 Combine like terms: 1.388888889 + -1.388888889 = 0.000000000 0.000000000 + x = -1.982173642 + -1.388888889 x = -1.982173642 + -1.388888889 Combine like terms: -1.982173642 + -1.388888889 = -3.371062531 x = -3.371062531 Simplifying x = -3.371062531

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.593284753, -3.371062531}

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