20x+51=x^2

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Solution for 20x+51=x^2 equation:


Simplifying
20x + 51 = x2

Reorder the terms:
51 + 20x = x2

Solving
51 + 20x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
51 + 20x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-51 + -20x + x2 = 0

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + -20x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + -20x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + -20x + x2 = 0 + 51
-20x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
-20x + x2 = 51

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 51 + 100

Reorder the terms:
100 + -20x + x2 = 51 + 100

Combine like terms: 51 + 100 = 151
100 + -20x + x2 = 151

Factor a perfect square on the left side:
(x + -10)(x + -10) = 151

Calculate the square root of the right side: 12.288205727

Break this problem into two subproblems by setting 
(x + -10) equal to 12.288205727 and -12.288205727.

Subproblem 1

x + -10 = 12.288205727 Simplifying x + -10 = 12.288205727 Reorder the terms: -10 + x = 12.288205727 Solving -10 + x = 12.288205727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 12.288205727 + 10 Combine like terms: -10 + 10 = 0 0 + x = 12.288205727 + 10 x = 12.288205727 + 10 Combine like terms: 12.288205727 + 10 = 22.288205727 x = 22.288205727 Simplifying x = 22.288205727

Subproblem 2

x + -10 = -12.288205727 Simplifying x + -10 = -12.288205727 Reorder the terms: -10 + x = -12.288205727 Solving -10 + x = -12.288205727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -12.288205727 + 10 Combine like terms: -10 + 10 = 0 0 + x = -12.288205727 + 10 x = -12.288205727 + 10 Combine like terms: -12.288205727 + 10 = -2.288205727 x = -2.288205727 Simplifying x = -2.288205727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.288205727, -2.288205727}

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