5x+50=x+1.25x^2

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Solution for 5x+50=x+1.25x^2 equation:


Simplifying
5x + 50 = x + 1.25x2

Reorder the terms:
50 + 5x = x + 1.25x2

Solving
50 + 5x = x + 1.25x2

Solving for variable 'x'.

Combine like terms: 5x + -1x = 4x
50 + 4x + -1.25x2 = x + 1.25x2 + -1x + -1.25x2

Reorder the terms:
50 + 4x + -1.25x2 = x + -1x + 1.25x2 + -1.25x2

Combine like terms: x + -1x = 0
50 + 4x + -1.25x2 = 0 + 1.25x2 + -1.25x2
50 + 4x + -1.25x2 = 1.25x2 + -1.25x2

Combine like terms: 1.25x2 + -1.25x2 = 0.00
50 + 4x + -1.25x2 = 0.00

Begin completing the square.  Divide all terms by
-1.25 the coefficient of the squared term: 

Divide each side by '-1.25'.
-40 + -3.2x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -3.2x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -3.2x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -3.2x + x2 = 0 + 40
-3.2x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-3.2x + x2 = 40

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = 40 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = 40 + 2.56

Combine like terms: 40 + 2.56 = 42.56
2.56 + -3.2x + x2 = 42.56

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 42.56

Calculate the square root of the right side: 6.523802572

Break this problem into two subproblems by setting 
(x + -1.6) equal to 6.523802572 and -6.523802572.

Subproblem 1

x + -1.6 = 6.523802572 Simplifying x + -1.6 = 6.523802572 Reorder the terms: -1.6 + x = 6.523802572 Solving -1.6 + x = 6.523802572 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 6.523802572 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 6.523802572 + 1.6 x = 6.523802572 + 1.6 Combine like terms: 6.523802572 + 1.6 = 8.123802572 x = 8.123802572 Simplifying x = 8.123802572

Subproblem 2

x + -1.6 = -6.523802572 Simplifying x + -1.6 = -6.523802572 Reorder the terms: -1.6 + x = -6.523802572 Solving -1.6 + x = -6.523802572 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -6.523802572 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -6.523802572 + 1.6 x = -6.523802572 + 1.6 Combine like terms: -6.523802572 + 1.6 = -4.923802572 x = -4.923802572 Simplifying x = -4.923802572

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.123802572, -4.923802572}

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