102=10x^2-x

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Solution for 102=10x^2-x equation:


Simplifying
102 = 10x2 + -1x

Reorder the terms:
102 = -1x + 10x2

Solving
102 = -1x + 10x2

Solving for variable 'x'.

Reorder the terms:
102 + x + -10x2 = -1x + x + 10x2 + -10x2

Combine like terms: -1x + x = 0
102 + x + -10x2 = 0 + 10x2 + -10x2
102 + x + -10x2 = 10x2 + -10x2

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

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

Divide each side by '-10'.
-10.2 + -0.1x + x2 = 0

Move the constant term to the right:

Add '10.2' to each side of the equation.
-10.2 + -0.1x + 10.2 + x2 = 0 + 10.2

Reorder the terms:
-10.2 + 10.2 + -0.1x + x2 = 0 + 10.2

Combine like terms: -10.2 + 10.2 = 0.0
0.0 + -0.1x + x2 = 0 + 10.2
-0.1x + x2 = 0 + 10.2

Combine like terms: 0 + 10.2 = 10.2
-0.1x + x2 = 10.2

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.1x + 0.25 + x2 = 10.2 + 0.25

Reorder the terms:
0.25 + -0.1x + x2 = 10.2 + 0.25

Combine like terms: 10.2 + 0.25 = 10.45
0.25 + -0.1x + x2 = 10.45

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 10.45

Calculate the square root of the right side: 3.232645975

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.232645975 and -3.232645975.

Subproblem 1

x + 0.5 = 3.232645975 Simplifying x + 0.5 = 3.232645975 Reorder the terms: 0.5 + x = 3.232645975 Solving 0.5 + x = 3.232645975 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.232645975 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.232645975 + -0.5 x = 3.232645975 + -0.5 Combine like terms: 3.232645975 + -0.5 = 2.732645975 x = 2.732645975 Simplifying x = 2.732645975

Subproblem 2

x + 0.5 = -3.232645975 Simplifying x + 0.5 = -3.232645975 Reorder the terms: 0.5 + x = -3.232645975 Solving 0.5 + x = -3.232645975 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.232645975 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.232645975 + -0.5 x = -3.232645975 + -0.5 Combine like terms: -3.232645975 + -0.5 = -3.732645975 x = -3.732645975 Simplifying x = -3.732645975

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.732645975, -3.732645975}

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