7x-9=5x^2-8-3x

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Solution for 7x-9=5x^2-8-3x equation:


Simplifying
7x + -9 = 5x2 + -8 + -3x

Reorder the terms:
-9 + 7x = 5x2 + -8 + -3x

Reorder the terms:
-9 + 7x = -8 + -3x + 5x2

Solving
-9 + 7x = -8 + -3x + 5x2

Solving for variable 'x'.

Reorder the terms:
-9 + 8 + 7x + 3x + -5x2 = -8 + -3x + 5x2 + 8 + 3x + -5x2

Combine like terms: -9 + 8 = -1
-1 + 7x + 3x + -5x2 = -8 + -3x + 5x2 + 8 + 3x + -5x2

Combine like terms: 7x + 3x = 10x
-1 + 10x + -5x2 = -8 + -3x + 5x2 + 8 + 3x + -5x2

Reorder the terms:
-1 + 10x + -5x2 = -8 + 8 + -3x + 3x + 5x2 + -5x2

Combine like terms: -8 + 8 = 0
-1 + 10x + -5x2 = 0 + -3x + 3x + 5x2 + -5x2
-1 + 10x + -5x2 = -3x + 3x + 5x2 + -5x2

Combine like terms: -3x + 3x = 0
-1 + 10x + -5x2 = 0 + 5x2 + -5x2
-1 + 10x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-1 + 10x + -5x2 = 0

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

Divide each side by '-5'.
0.2 + -2x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + -2x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + -2x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + -2x + x2 = 0 + -0.2
-2x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
-2x + x2 = -0.2

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = -0.2 + 1

Reorder the terms:
1 + -2x + x2 = -0.2 + 1

Combine like terms: -0.2 + 1 = 0.8
1 + -2x + x2 = 0.8

Factor a perfect square on the left side:
(x + -1)(x + -1) = 0.8

Calculate the square root of the right side: 0.894427191

Break this problem into two subproblems by setting 
(x + -1) equal to 0.894427191 and -0.894427191.

Subproblem 1

x + -1 = 0.894427191 Simplifying x + -1 = 0.894427191 Reorder the terms: -1 + x = 0.894427191 Solving -1 + x = 0.894427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 0.894427191 + 1 Combine like terms: -1 + 1 = 0 0 + x = 0.894427191 + 1 x = 0.894427191 + 1 Combine like terms: 0.894427191 + 1 = 1.894427191 x = 1.894427191 Simplifying x = 1.894427191

Subproblem 2

x + -1 = -0.894427191 Simplifying x + -1 = -0.894427191 Reorder the terms: -1 + x = -0.894427191 Solving -1 + x = -0.894427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -0.894427191 + 1 Combine like terms: -1 + 1 = 0 0 + x = -0.894427191 + 1 x = -0.894427191 + 1 Combine like terms: -0.894427191 + 1 = 0.105572809 x = 0.105572809 Simplifying x = 0.105572809

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.894427191, 0.105572809}

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