.25(x+8)=.5(x^2+1)

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Solution for .25(x+8)=.5(x^2+1) equation:


Simplifying
0.25(x + 8) = 0.5(x2 + 1)

Reorder the terms:
0.25(8 + x) = 0.5(x2 + 1)
(8 * 0.25 + x * 0.25) = 0.5(x2 + 1)
(2 + 0.25x) = 0.5(x2 + 1)

Reorder the terms:
2 + 0.25x = 0.5(1 + x2)
2 + 0.25x = (1 * 0.5 + x2 * 0.5)
2 + 0.25x = (0.5 + 0.5x2)

Solving
2 + 0.25x = 0.5 + 0.5x2

Solving for variable 'x'.

Reorder the terms:
2 + -0.5 + 0.25x + -0.5x2 = 0.5 + 0.5x2 + -0.5 + -0.5x2

Combine like terms: 2 + -0.5 = 1.5
1.5 + 0.25x + -0.5x2 = 0.5 + 0.5x2 + -0.5 + -0.5x2

Reorder the terms:
1.5 + 0.25x + -0.5x2 = 0.5 + -0.5 + 0.5x2 + -0.5x2

Combine like terms: 0.5 + -0.5 = 0.0
1.5 + 0.25x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
1.5 + 0.25x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
1.5 + 0.25x + -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'.
-3 + -0.5x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.5x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -0.5x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.5x + x2 = 0 + 3
-0.5x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.5x + x2 = 3

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 3 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 3 + 0.0625

Combine like terms: 3 + 0.0625 = 3.0625
0.0625 + -0.5x + x2 = 3.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 3.0625

Calculate the square root of the right side: 1.75

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.75 and -1.75.

Subproblem 1

x + -0.25 = 1.75 Simplifying x + -0.25 = 1.75 Reorder the terms: -0.25 + x = 1.75 Solving -0.25 + x = 1.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.75 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.75 + 0.25 x = 1.75 + 0.25 Combine like terms: 1.75 + 0.25 = 2 x = 2 Simplifying x = 2

Subproblem 2

x + -0.25 = -1.75 Simplifying x + -0.25 = -1.75 Reorder the terms: -0.25 + x = -1.75 Solving -0.25 + x = -1.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.75 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.75 + 0.25 x = -1.75 + 0.25 Combine like terms: -1.75 + 0.25 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2, -1.5}

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