x^2=10+x(7-9x)

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Solution for x^2=10+x(7-9x) equation:


Simplifying
x2 = 10 + x(7 + -9x)
x2 = 10 + (7 * x + -9x * x)
x2 = 10 + (7x + -9x2)

Solving
x2 = 10 + 7x + -9x2

Solving for variable 'x'.

Reorder the terms:
-10 + -7x + x2 + 9x2 = 10 + 7x + -9x2 + -10 + -7x + 9x2

Combine like terms: x2 + 9x2 = 10x2
-10 + -7x + 10x2 = 10 + 7x + -9x2 + -10 + -7x + 9x2

Reorder the terms:
-10 + -7x + 10x2 = 10 + -10 + 7x + -7x + -9x2 + 9x2

Combine like terms: 10 + -10 = 0
-10 + -7x + 10x2 = 0 + 7x + -7x + -9x2 + 9x2
-10 + -7x + 10x2 = 7x + -7x + -9x2 + 9x2

Combine like terms: 7x + -7x = 0
-10 + -7x + 10x2 = 0 + -9x2 + 9x2
-10 + -7x + 10x2 = -9x2 + 9x2

Combine like terms: -9x2 + 9x2 = 0
-10 + -7x + 10x2 = 0

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

Divide each side by '10'.
-1 + -0.7x + x2 = 0.0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.7x + 1 + x2 = 0.0 + 1

Reorder the terms:
-1 + 1 + -0.7x + x2 = 0.0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.7x + x2 = 0.0 + 1
-0.7x + x2 = 0.0 + 1

Combine like terms: 0.0 + 1 = 1
-0.7x + x2 = 1

The x term is -0.7x.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7x + 0.1225 + x2 = 1 + 0.1225

Reorder the terms:
0.1225 + -0.7x + x2 = 1 + 0.1225

Combine like terms: 1 + 0.1225 = 1.1225
0.1225 + -0.7x + x2 = 1.1225

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 1.1225

Calculate the square root of the right side: 1.059481005

Break this problem into two subproblems by setting 
(x + -0.35) equal to 1.059481005 and -1.059481005.

Subproblem 1

x + -0.35 = 1.059481005 Simplifying x + -0.35 = 1.059481005 Reorder the terms: -0.35 + x = 1.059481005 Solving -0.35 + x = 1.059481005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = 1.059481005 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 1.059481005 + 0.35 x = 1.059481005 + 0.35 Combine like terms: 1.059481005 + 0.35 = 1.409481005 x = 1.409481005 Simplifying x = 1.409481005

Subproblem 2

x + -0.35 = -1.059481005 Simplifying x + -0.35 = -1.059481005 Reorder the terms: -0.35 + x = -1.059481005 Solving -0.35 + x = -1.059481005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = -1.059481005 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -1.059481005 + 0.35 x = -1.059481005 + 0.35 Combine like terms: -1.059481005 + 0.35 = -0.709481005 x = -0.709481005 Simplifying x = -0.709481005

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.409481005, -0.709481005}

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