2x^2-10x+4=x^2+9

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


Simplifying
2x2 + -10x + 4 = x2 + 9

Reorder the terms:
4 + -10x + 2x2 = x2 + 9

Reorder the terms:
4 + -10x + 2x2 = 9 + x2

Solving
4 + -10x + 2x2 = 9 + x2

Solving for variable 'x'.

Reorder the terms:
4 + -9 + -10x + 2x2 + -1x2 = 9 + x2 + -9 + -1x2

Combine like terms: 4 + -9 = -5
-5 + -10x + 2x2 + -1x2 = 9 + x2 + -9 + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-5 + -10x + 1x2 = 9 + x2 + -9 + -1x2

Reorder the terms:
-5 + -10x + 1x2 = 9 + -9 + x2 + -1x2

Combine like terms: 9 + -9 = 0
-5 + -10x + 1x2 = 0 + x2 + -1x2
-5 + -10x + 1x2 = x2 + -1x2

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

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -10x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -10x + x2 = 0 + 5

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

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

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 5 + 25

Reorder the terms:
25 + -10x + x2 = 5 + 25

Combine like terms: 5 + 25 = 30
25 + -10x + x2 = 30

Factor a perfect square on the left side:
(x + -5)(x + -5) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(x + -5) equal to 5.477225575 and -5.477225575.

Subproblem 1

x + -5 = 5.477225575 Simplifying x + -5 = 5.477225575 Reorder the terms: -5 + x = 5.477225575 Solving -5 + x = 5.477225575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.477225575 + 5 x = 5.477225575 + 5 Combine like terms: 5.477225575 + 5 = 10.477225575 x = 10.477225575 Simplifying x = 10.477225575

Subproblem 2

x + -5 = -5.477225575 Simplifying x + -5 = -5.477225575 Reorder the terms: -5 + x = -5.477225575 Solving -5 + x = -5.477225575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.477225575 + 5 x = -5.477225575 + 5 Combine like terms: -5.477225575 + 5 = -0.477225575 x = -0.477225575 Simplifying x = -0.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.477225575, -0.477225575}

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