-2.5x+1=x^2-x

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Solution for -2.5x+1=x^2-x equation:


Simplifying
-2.5x + 1 = x2 + -1x

Reorder the terms:
1 + -2.5x = x2 + -1x

Reorder the terms:
1 + -2.5x = -1x + x2

Solving
1 + -2.5x = -1x + x2

Solving for variable 'x'.

Combine like terms: -2.5x + x = -1.5x
1 + -1.5x + -1x2 = -1x + x2 + x + -1x2

Reorder the terms:
1 + -1.5x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
1 + -1.5x + -1x2 = 0 + x2 + -1x2
1 + -1.5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1 + -1.5x + -1x2 = 0

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

Divide each side by '-1'.
-1 + 1.5x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 1.5x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 1.5x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 1.5x + x2 = 0 + 1
1.5x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
1.5x + x2 = 1

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 1 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 1 + 0.5625

Combine like terms: 1 + 0.5625 = 1.5625
0.5625 + 1.5x + x2 = 1.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.5625

Calculate the square root of the right side: 1.25

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.25 and -1.25.

Subproblem 1

x + 0.75 = 1.25 Simplifying x + 0.75 = 1.25 Reorder the terms: 0.75 + x = 1.25 Solving 0.75 + x = 1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.25 + -0.75 x = 1.25 + -0.75 Combine like terms: 1.25 + -0.75 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 0.75 = -1.25 Simplifying x + 0.75 = -1.25 Reorder the terms: 0.75 + x = -1.25 Solving 0.75 + x = -1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.25 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.25 + -0.75 x = -1.25 + -0.75 Combine like terms: -1.25 + -0.75 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -2}

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