8x(5x+9)=9

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Solution for 8x(5x+9)=9 equation:


Simplifying
8x(5x + 9) = 9

Reorder the terms:
8x(9 + 5x) = 9
(9 * 8x + 5x * 8x) = 9
(72x + 40x2) = 9

Solving
72x + 40x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 72x + 40x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 72x + 40x2 = 0

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

Divide each side by '40'.
-0.225 + 1.8x + x2 = 0.0

Move the constant term to the right:

Add '0.225' to each side of the equation.
-0.225 + 1.8x + 0.225 + x2 = 0.0 + 0.225

Reorder the terms:
-0.225 + 0.225 + 1.8x + x2 = 0.0 + 0.225

Combine like terms: -0.225 + 0.225 = 0.000
0.000 + 1.8x + x2 = 0.0 + 0.225
1.8x + x2 = 0.0 + 0.225

Combine like terms: 0.0 + 0.225 = 0.225
1.8x + x2 = 0.225

The x term is 1.8x.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8x + 0.81 + x2 = 0.225 + 0.81

Reorder the terms:
0.81 + 1.8x + x2 = 0.225 + 0.81

Combine like terms: 0.225 + 0.81 = 1.035
0.81 + 1.8x + x2 = 1.035

Factor a perfect square on the left side:
(x + 0.9)(x + 0.9) = 1.035

Calculate the square root of the right side: 1.017349497

Break this problem into two subproblems by setting 
(x + 0.9) equal to 1.017349497 and -1.017349497.

Subproblem 1

x + 0.9 = 1.017349497 Simplifying x + 0.9 = 1.017349497 Reorder the terms: 0.9 + x = 1.017349497 Solving 0.9 + x = 1.017349497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = 1.017349497 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = 1.017349497 + -0.9 x = 1.017349497 + -0.9 Combine like terms: 1.017349497 + -0.9 = 0.117349497 x = 0.117349497 Simplifying x = 0.117349497

Subproblem 2

x + 0.9 = -1.017349497 Simplifying x + 0.9 = -1.017349497 Reorder the terms: 0.9 + x = -1.017349497 Solving 0.9 + x = -1.017349497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = -1.017349497 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = -1.017349497 + -0.9 x = -1.017349497 + -0.9 Combine like terms: -1.017349497 + -0.9 = -1.917349497 x = -1.917349497 Simplifying x = -1.917349497

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.117349497, -1.917349497}

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