0=x^2-x-0.24

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Solution for 0=x^2-x-0.24 equation:


Simplifying
0 = x2 + -1x + -0.24

Reorder the terms:
0 = -0.24 + -1x + x2

Solving
0 = -0.24 + -1x + x2

Solving for variable 'x'.

Combine like terms: 0 + 0.24 = 0.24
0.24 + x + -1x2 = -0.24 + -1x + x2 + 0.24 + x + -1x2

Reorder the terms:
0.24 + x + -1x2 = -0.24 + 0.24 + -1x + x + x2 + -1x2

Combine like terms: -0.24 + 0.24 = 0.00
0.24 + x + -1x2 = 0.00 + -1x + x + x2 + -1x2
0.24 + x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
0.24 + x + -1x2 = 0 + x2 + -1x2
0.24 + x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.24 + x + -1x2 = 0

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

Divide each side by '-1'.
-0.24 + -1x + x2 = 0

Move the constant term to the right:

Add '0.24' to each side of the equation.
-0.24 + -1x + 0.24 + x2 = 0 + 0.24

Reorder the terms:
-0.24 + 0.24 + -1x + x2 = 0 + 0.24

Combine like terms: -0.24 + 0.24 = 0.00
0.00 + -1x + x2 = 0 + 0.24
-1x + x2 = 0 + 0.24

Combine like terms: 0 + 0.24 = 0.24
-1x + x2 = 0.24

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.
-1x + 0.25 + x2 = 0.24 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.24 + 0.25

Combine like terms: 0.24 + 0.25 = 0.49
0.25 + -1x + x2 = 0.49

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.49

Calculate the square root of the right side: 0.7

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.7 and -0.7.

Subproblem 1

x + 0.5 = 0.7 Simplifying x + 0.5 = 0.7 Reorder the terms: 0.5 + x = 0.7 Solving 0.5 + x = 0.7 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 = 0.7 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.7 + -0.5 x = 0.7 + -0.5 Combine like terms: 0.7 + -0.5 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + 0.5 = -0.7 Simplifying x + 0.5 = -0.7 Reorder the terms: 0.5 + x = -0.7 Solving 0.5 + x = -0.7 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 = -0.7 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.7 + -0.5 x = -0.7 + -0.5 Combine like terms: -0.7 + -0.5 = -1.2 x = -1.2 Simplifying x = -1.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, -1.2}

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