8x^2=3-9x

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Solution for 8x^2=3-9x equation:


Simplifying
8x2 = 3 + -9x

Solving
8x2 = 3 + -9x

Solving for variable 'x'.

Reorder the terms:
-3 + 9x + 8x2 = 3 + -9x + -3 + 9x

Reorder the terms:
-3 + 9x + 8x2 = 3 + -3 + -9x + 9x

Combine like terms: 3 + -3 = 0
-3 + 9x + 8x2 = 0 + -9x + 9x
-3 + 9x + 8x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
-3 + 9x + 8x2 = 0

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

Divide each side by '8'.
-0.375 + 1.125x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + 1.125x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + 1.125x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + 1.125x + x2 = 0 + 0.375
1.125x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
1.125x + x2 = 0.375

The x term is 1.125x.  Take half its coefficient (0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
1.125x + 0.31640625 + x2 = 0.375 + 0.31640625

Reorder the terms:
0.31640625 + 1.125x + x2 = 0.375 + 0.31640625

Combine like terms: 0.375 + 0.31640625 = 0.69140625
0.31640625 + 1.125x + x2 = 0.69140625

Factor a perfect square on the left side:
(x + 0.5625)(x + 0.5625) = 0.69140625

Calculate the square root of the right side: 0.831508418

Break this problem into two subproblems by setting 
(x + 0.5625) equal to 0.831508418 and -0.831508418.

Subproblem 1

x + 0.5625 = 0.831508418 Simplifying x + 0.5625 = 0.831508418 Reorder the terms: 0.5625 + x = 0.831508418 Solving 0.5625 + x = 0.831508418 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + x = 0.831508418 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + x = 0.831508418 + -0.5625 x = 0.831508418 + -0.5625 Combine like terms: 0.831508418 + -0.5625 = 0.269008418 x = 0.269008418 Simplifying x = 0.269008418

Subproblem 2

x + 0.5625 = -0.831508418 Simplifying x + 0.5625 = -0.831508418 Reorder the terms: 0.5625 + x = -0.831508418 Solving 0.5625 + x = -0.831508418 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + x = -0.831508418 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + x = -0.831508418 + -0.5625 x = -0.831508418 + -0.5625 Combine like terms: -0.831508418 + -0.5625 = -1.394008418 x = -1.394008418 Simplifying x = -1.394008418

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.269008418, -1.394008418}

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