.25x^2+.75x=1

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Solution for .25x^2+.75x=1 equation:


Simplifying
0.25x2 + 0.75x = 1

Reorder the terms:
0.75x + 0.25x2 = 1

Solving
0.75x + 0.25x2 = 1

Solving for variable 'x'.

Reorder the terms:
-1 + 0.75x + 0.25x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 0.75x + 0.25x2 = 0

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

Divide each side by '0.25'.
-4 + 3x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 3x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 3x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 3x + x2 = 0 + 4
3x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
3x + x2 = 4

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 4 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 4 + 2.25

Combine like terms: 4 + 2.25 = 6.25
2.25 + 3x + x2 = 6.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 6.25

Calculate the square root of the right side: 2.5

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.5 and -2.5.

Subproblem 1

x + 1.5 = 2.5 Simplifying x + 1.5 = 2.5 Reorder the terms: 1.5 + x = 2.5 Solving 1.5 + x = 2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 2.5 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 2.5 + -1.5 x = 2.5 + -1.5 Combine like terms: 2.5 + -1.5 = 1 x = 1 Simplifying x = 1

Subproblem 2

x + 1.5 = -2.5 Simplifying x + 1.5 = -2.5 Reorder the terms: 1.5 + x = -2.5 Solving 1.5 + x = -2.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -2.5 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -2.5 + -1.5 x = -2.5 + -1.5 Combine like terms: -2.5 + -1.5 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1, -4}

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