10x^2+6x-99=100

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Solution for 10x^2+6x-99=100 equation:


Simplifying
10x2 + 6x + -99 = 100

Reorder the terms:
-99 + 6x + 10x2 = 100

Solving
-99 + 6x + 10x2 = 100

Solving for variable 'x'.

Reorder the terms:
-99 + -100 + 6x + 10x2 = 100 + -100

Combine like terms: -99 + -100 = -199
-199 + 6x + 10x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-199 + 6x + 10x2 = 0

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

Divide each side by '10'.
-19.9 + 0.6x + x2 = 0

Move the constant term to the right:

Add '19.9' to each side of the equation.
-19.9 + 0.6x + 19.9 + x2 = 0 + 19.9

Reorder the terms:
-19.9 + 19.9 + 0.6x + x2 = 0 + 19.9

Combine like terms: -19.9 + 19.9 = 0.0
0.0 + 0.6x + x2 = 0 + 19.9
0.6x + x2 = 0 + 19.9

Combine like terms: 0 + 19.9 = 19.9
0.6x + x2 = 19.9

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 19.9 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 19.9 + 0.09

Combine like terms: 19.9 + 0.09 = 19.99
0.09 + 0.6x + x2 = 19.99

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 19.99

Calculate the square root of the right side: 4.471017781

Break this problem into two subproblems by setting 
(x + 0.3) equal to 4.471017781 and -4.471017781.

Subproblem 1

x + 0.3 = 4.471017781 Simplifying x + 0.3 = 4.471017781 Reorder the terms: 0.3 + x = 4.471017781 Solving 0.3 + x = 4.471017781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 4.471017781 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 4.471017781 + -0.3 x = 4.471017781 + -0.3 Combine like terms: 4.471017781 + -0.3 = 4.171017781 x = 4.171017781 Simplifying x = 4.171017781

Subproblem 2

x + 0.3 = -4.471017781 Simplifying x + 0.3 = -4.471017781 Reorder the terms: 0.3 + x = -4.471017781 Solving 0.3 + x = -4.471017781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -4.471017781 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -4.471017781 + -0.3 x = -4.471017781 + -0.3 Combine like terms: -4.471017781 + -0.3 = -4.771017781 x = -4.771017781 Simplifying x = -4.771017781

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.171017781, -4.771017781}

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