x^2-8=5x+30

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Solution for x^2-8=5x+30 equation:


Simplifying
x2 + -8 = 5x + 30

Reorder the terms:
-8 + x2 = 5x + 30

Reorder the terms:
-8 + x2 = 30 + 5x

Solving
-8 + x2 = 30 + 5x

Solving for variable 'x'.

Reorder the terms:
-8 + -30 + -5x + x2 = 30 + 5x + -30 + -5x

Combine like terms: -8 + -30 = -38
-38 + -5x + x2 = 30 + 5x + -30 + -5x

Reorder the terms:
-38 + -5x + x2 = 30 + -30 + 5x + -5x

Combine like terms: 30 + -30 = 0
-38 + -5x + x2 = 0 + 5x + -5x
-38 + -5x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-38 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + -5x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + -5x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + -5x + x2 = 0 + 38
-5x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
-5x + x2 = 38

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 38 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 38 + 6.25

Combine like terms: 38 + 6.25 = 44.25
6.25 + -5x + x2 = 44.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 44.25

Calculate the square root of the right side: 6.652067348

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.652067348 and -6.652067348.

Subproblem 1

x + -2.5 = 6.652067348 Simplifying x + -2.5 = 6.652067348 Reorder the terms: -2.5 + x = 6.652067348 Solving -2.5 + x = 6.652067348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 6.652067348 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.652067348 + 2.5 x = 6.652067348 + 2.5 Combine like terms: 6.652067348 + 2.5 = 9.152067348 x = 9.152067348 Simplifying x = 9.152067348

Subproblem 2

x + -2.5 = -6.652067348 Simplifying x + -2.5 = -6.652067348 Reorder the terms: -2.5 + x = -6.652067348 Solving -2.5 + x = -6.652067348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -6.652067348 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.652067348 + 2.5 x = -6.652067348 + 2.5 Combine like terms: -6.652067348 + 2.5 = -4.152067348 x = -4.152067348 Simplifying x = -4.152067348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.152067348, -4.152067348}

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