-x^2+20x+10=0

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Solution for -x^2+20x+10=0 equation:


Simplifying
-1x2 + 20x + 10 = 0

Reorder the terms:
10 + 20x + -1x2 = 0

Solving
10 + 20x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-10 + -20x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -20x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -20x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -20x + x2 = 0 + 10
-20x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-20x + x2 = 10

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 = 10 + 100

Reorder the terms:
100 + -20x + x2 = 10 + 100

Combine like terms: 10 + 100 = 110
100 + -20x + x2 = 110

Factor a perfect square on the left side:
(x + -10)(x + -10) = 110

Calculate the square root of the right side: 10.488088482

Break this problem into two subproblems by setting 
(x + -10) equal to 10.488088482 and -10.488088482.

Subproblem 1

x + -10 = 10.488088482 Simplifying x + -10 = 10.488088482 Reorder the terms: -10 + x = 10.488088482 Solving -10 + x = 10.488088482 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 = 10.488088482 + 10 Combine like terms: -10 + 10 = 0 0 + x = 10.488088482 + 10 x = 10.488088482 + 10 Combine like terms: 10.488088482 + 10 = 20.488088482 x = 20.488088482 Simplifying x = 20.488088482

Subproblem 2

x + -10 = -10.488088482 Simplifying x + -10 = -10.488088482 Reorder the terms: -10 + x = -10.488088482 Solving -10 + x = -10.488088482 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 = -10.488088482 + 10 Combine like terms: -10 + 10 = 0 0 + x = -10.488088482 + 10 x = -10.488088482 + 10 Combine like terms: -10.488088482 + 10 = -0.488088482 x = -0.488088482 Simplifying x = -0.488088482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.488088482, -0.488088482}

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