x^2=5x+28

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Solution for x^2=5x+28 equation:


Simplifying
x2 = 5x + 28

Reorder the terms:
x2 = 28 + 5x

Solving
x2 = 28 + 5x

Solving for variable 'x'.

Reorder the terms:
-28 + -5x + x2 = 28 + 5x + -28 + -5x

Reorder the terms:
-28 + -5x + x2 = 28 + -28 + 5x + -5x

Combine like terms: 28 + -28 = 0
-28 + -5x + x2 = 0 + 5x + -5x
-28 + -5x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-28 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -5x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + -5x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -5x + x2 = 0 + 28
-5x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
-5x + x2 = 28

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 = 28 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 28 + 6.25

Combine like terms: 28 + 6.25 = 34.25
6.25 + -5x + x2 = 34.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

x + -2.5 = 5.852349955 Simplifying x + -2.5 = 5.852349955 Reorder the terms: -2.5 + x = 5.852349955 Solving -2.5 + x = 5.852349955 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 = 5.852349955 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 5.852349955 + 2.5 x = 5.852349955 + 2.5 Combine like terms: 5.852349955 + 2.5 = 8.352349955 x = 8.352349955 Simplifying x = 8.352349955

Subproblem 2

x + -2.5 = -5.852349955 Simplifying x + -2.5 = -5.852349955 Reorder the terms: -2.5 + x = -5.852349955 Solving -2.5 + x = -5.852349955 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 = -5.852349955 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -5.852349955 + 2.5 x = -5.852349955 + 2.5 Combine like terms: -5.852349955 + 2.5 = -3.352349955 x = -3.352349955 Simplifying x = -3.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.352349955, -3.352349955}

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