2x*x-5x=100

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Solution for 2x*x-5x=100 equation:


Simplifying
2x * x + -5x = 100

Multiply x * x
2x2 + -5x = 100

Reorder the terms:
-5x + 2x2 = 100

Solving
-5x + 2x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + -5x + 2x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -5x + 2x2 = 0

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

Divide each side by '2'.
-50 + -2.5x + x2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + -2.5x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + -2.5x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + -2.5x + x2 = 0 + 50
-2.5x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
-2.5x + x2 = 50

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 50 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 50 + 1.5625

Combine like terms: 50 + 1.5625 = 51.5625
1.5625 + -2.5x + x2 = 51.5625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 51.5625

Calculate the square root of the right side: 7.180703308

Break this problem into two subproblems by setting 
(x + -1.25) equal to 7.180703308 and -7.180703308.

Subproblem 1

x + -1.25 = 7.180703308 Simplifying x + -1.25 = 7.180703308 Reorder the terms: -1.25 + x = 7.180703308 Solving -1.25 + x = 7.180703308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 7.180703308 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 7.180703308 + 1.25 x = 7.180703308 + 1.25 Combine like terms: 7.180703308 + 1.25 = 8.430703308 x = 8.430703308 Simplifying x = 8.430703308

Subproblem 2

x + -1.25 = -7.180703308 Simplifying x + -1.25 = -7.180703308 Reorder the terms: -1.25 + x = -7.180703308 Solving -1.25 + x = -7.180703308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -7.180703308 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -7.180703308 + 1.25 x = -7.180703308 + 1.25 Combine like terms: -7.180703308 + 1.25 = -5.930703308 x = -5.930703308 Simplifying x = -5.930703308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.430703308, -5.930703308}

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