100x^2-21x=110

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Solution for 100x^2-21x=110 equation:


Simplifying
100x2 + -21x = 110

Reorder the terms:
-21x + 100x2 = 110

Solving
-21x + 100x2 = 110

Solving for variable 'x'.

Reorder the terms:
-110 + -21x + 100x2 = 110 + -110

Combine like terms: 110 + -110 = 0
-110 + -21x + 100x2 = 0

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

Divide each side by '100'.
-1.1 + -0.21x + x2 = 0

Move the constant term to the right:

Add '1.1' to each side of the equation.
-1.1 + -0.21x + 1.1 + x2 = 0 + 1.1

Reorder the terms:
-1.1 + 1.1 + -0.21x + x2 = 0 + 1.1

Combine like terms: -1.1 + 1.1 = 0.0
0.0 + -0.21x + x2 = 0 + 1.1
-0.21x + x2 = 0 + 1.1

Combine like terms: 0 + 1.1 = 1.1
-0.21x + x2 = 1.1

The x term is -0.21x.  Take half its coefficient (-0.105).
Square it (0.011025) and add it to both sides.

Add '0.011025' to each side of the equation.
-0.21x + 0.011025 + x2 = 1.1 + 0.011025

Reorder the terms:
0.011025 + -0.21x + x2 = 1.1 + 0.011025

Combine like terms: 1.1 + 0.011025 = 1.111025
0.011025 + -0.21x + x2 = 1.111025

Factor a perfect square on the left side:
(x + -0.105)(x + -0.105) = 1.111025

Calculate the square root of the right side: 1.054051707

Break this problem into two subproblems by setting 
(x + -0.105) equal to 1.054051707 and -1.054051707.

Subproblem 1

x + -0.105 = 1.054051707 Simplifying x + -0.105 = 1.054051707 Reorder the terms: -0.105 + x = 1.054051707 Solving -0.105 + x = 1.054051707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.105' to each side of the equation. -0.105 + 0.105 + x = 1.054051707 + 0.105 Combine like terms: -0.105 + 0.105 = 0.000 0.000 + x = 1.054051707 + 0.105 x = 1.054051707 + 0.105 Combine like terms: 1.054051707 + 0.105 = 1.159051707 x = 1.159051707 Simplifying x = 1.159051707

Subproblem 2

x + -0.105 = -1.054051707 Simplifying x + -0.105 = -1.054051707 Reorder the terms: -0.105 + x = -1.054051707 Solving -0.105 + x = -1.054051707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.105' to each side of the equation. -0.105 + 0.105 + x = -1.054051707 + 0.105 Combine like terms: -0.105 + 0.105 = 0.000 0.000 + x = -1.054051707 + 0.105 x = -1.054051707 + 0.105 Combine like terms: -1.054051707 + 0.105 = -0.949051707 x = -0.949051707 Simplifying x = -0.949051707

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.159051707, -0.949051707}

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