1.38=-0.5x^2+x+4

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Solution for 1.38=-0.5x^2+x+4 equation:


Simplifying
1.38 = -0.5x2 + x + 4

Reorder the terms:
1.38 = 4 + x + -0.5x2

Solving
1.38 = 4 + x + -0.5x2

Solving for variable 'x'.

Combine like terms: 1.38 + -4 = -2.62
-2.62 + -1x + 0.5x2 = 4 + x + -0.5x2 + -4 + -1x + 0.5x2

Reorder the terms:
-2.62 + -1x + 0.5x2 = 4 + -4 + x + -1x + -0.5x2 + 0.5x2

Combine like terms: 4 + -4 = 0
-2.62 + -1x + 0.5x2 = 0 + x + -1x + -0.5x2 + 0.5x2
-2.62 + -1x + 0.5x2 = x + -1x + -0.5x2 + 0.5x2

Combine like terms: x + -1x = 0
-2.62 + -1x + 0.5x2 = 0 + -0.5x2 + 0.5x2
-2.62 + -1x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
-2.62 + -1x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
-5.24 + -2x + x2 = 0

Move the constant term to the right:

Add '5.24' to each side of the equation.
-5.24 + -2x + 5.24 + x2 = 0 + 5.24

Reorder the terms:
-5.24 + 5.24 + -2x + x2 = 0 + 5.24

Combine like terms: -5.24 + 5.24 = 0.00
0.00 + -2x + x2 = 0 + 5.24
-2x + x2 = 0 + 5.24

Combine like terms: 0 + 5.24 = 5.24
-2x + x2 = 5.24

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 5.24 + 1

Reorder the terms:
1 + -2x + x2 = 5.24 + 1

Combine like terms: 5.24 + 1 = 6.24
1 + -2x + x2 = 6.24

Factor a perfect square on the left side:
(x + -1)(x + -1) = 6.24

Calculate the square root of the right side: 2.497999199

Break this problem into two subproblems by setting 
(x + -1) equal to 2.497999199 and -2.497999199.

Subproblem 1

x + -1 = 2.497999199 Simplifying x + -1 = 2.497999199 Reorder the terms: -1 + x = 2.497999199 Solving -1 + x = 2.497999199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.497999199 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.497999199 + 1 x = 2.497999199 + 1 Combine like terms: 2.497999199 + 1 = 3.497999199 x = 3.497999199 Simplifying x = 3.497999199

Subproblem 2

x + -1 = -2.497999199 Simplifying x + -1 = -2.497999199 Reorder the terms: -1 + x = -2.497999199 Solving -1 + x = -2.497999199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.497999199 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.497999199 + 1 x = -2.497999199 + 1 Combine like terms: -2.497999199 + 1 = -1.497999199 x = -1.497999199 Simplifying x = -1.497999199

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.497999199, -1.497999199}

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