4x^2+10x+25=9x^2+18x+9

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Solution for 4x^2+10x+25=9x^2+18x+9 equation:


Simplifying
4x2 + 10x + 25 = 9x2 + 18x + 9

Reorder the terms:
25 + 10x + 4x2 = 9x2 + 18x + 9

Reorder the terms:
25 + 10x + 4x2 = 9 + 18x + 9x2

Solving
25 + 10x + 4x2 = 9 + 18x + 9x2

Solving for variable 'x'.

Reorder the terms:
25 + -9 + 10x + -18x + 4x2 + -9x2 = 9 + 18x + 9x2 + -9 + -18x + -9x2

Combine like terms: 25 + -9 = 16
16 + 10x + -18x + 4x2 + -9x2 = 9 + 18x + 9x2 + -9 + -18x + -9x2

Combine like terms: 10x + -18x = -8x
16 + -8x + 4x2 + -9x2 = 9 + 18x + 9x2 + -9 + -18x + -9x2

Combine like terms: 4x2 + -9x2 = -5x2
16 + -8x + -5x2 = 9 + 18x + 9x2 + -9 + -18x + -9x2

Reorder the terms:
16 + -8x + -5x2 = 9 + -9 + 18x + -18x + 9x2 + -9x2

Combine like terms: 9 + -9 = 0
16 + -8x + -5x2 = 0 + 18x + -18x + 9x2 + -9x2
16 + -8x + -5x2 = 18x + -18x + 9x2 + -9x2

Combine like terms: 18x + -18x = 0
16 + -8x + -5x2 = 0 + 9x2 + -9x2
16 + -8x + -5x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
16 + -8x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-3.2 + 1.6x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + 1.6x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + 1.6x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + 1.6x + x2 = 0 + 3.2
1.6x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
1.6x + x2 = 3.2

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 3.2 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 3.2 + 0.64

Combine like terms: 3.2 + 0.64 = 3.84
0.64 + 1.6x + x2 = 3.84

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(x + 0.8) equal to 1.959591794 and -1.959591794.

Subproblem 1

x + 0.8 = 1.959591794 Simplifying x + 0.8 = 1.959591794 Reorder the terms: 0.8 + x = 1.959591794 Solving 0.8 + x = 1.959591794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 1.959591794 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 1.959591794 + -0.8 x = 1.959591794 + -0.8 Combine like terms: 1.959591794 + -0.8 = 1.159591794 x = 1.159591794 Simplifying x = 1.159591794

Subproblem 2

x + 0.8 = -1.959591794 Simplifying x + 0.8 = -1.959591794 Reorder the terms: 0.8 + x = -1.959591794 Solving 0.8 + x = -1.959591794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -1.959591794 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -1.959591794 + -0.8 x = -1.959591794 + -0.8 Combine like terms: -1.959591794 + -0.8 = -2.759591794 x = -2.759591794 Simplifying x = -2.759591794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.159591794, -2.759591794}

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