(0.5x^2)-(1.25x)+3=6

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Solution for (0.5x^2)-(1.25x)+3=6 equation:


Simplifying
(0.5x2) + -1(1.25x) + 3 = 6

Remove parenthesis around (1.25x)
(0.5x2) + -1 * 1.25x + 3 = 6

Multiply -1 * 1.25
(0.5x2) + -1.25x + 3 = 6

Reorder the terms:
3 + -1.25x + (0.5x2) = 6

Solving
3 + -1.25x + (0.5x2) = 6

Solving for variable 'x'.

Reorder the terms:
3 + -6 + -1.25x + (0.5x2) = 6 + -6

Combine like terms: 3 + -6 = -3
-3 + -1.25x + (0.5x2) = 6 + -6

Combine like terms: 6 + -6 = 0
-3 + -1.25x + (0.5x2) = 0

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

Divide each side by '0.5'.
-6 + -2.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -2.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -2.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -2.5x + x2 = 0 + 6
-2.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-2.5x + x2 = 6

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 6 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 6 + 1.5625

Combine like terms: 6 + 1.5625 = 7.5625
1.5625 + -2.5x + x2 = 7.5625

Factor a perfect square on the left side:
((x) + -1.25)((x) + -1.25) = 7.5625

Calculate the square root of the right side: 2.75

Break this problem into two subproblems by setting 
((x) + -1.25) equal to 2.75 and -2.75.

Subproblem 1

(x) + -1.25 = 2.75 Simplifying (x) + -1.25 = 2.75 x + -1.25 = 2.75 Reorder the terms: -1.25 + x = 2.75 Solving -1.25 + x = 2.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 2.75 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.75 + 1.25 x = 2.75 + 1.25 Combine like terms: 2.75 + 1.25 = 4 x = 4 Simplifying x = 4

Subproblem 2

(x) + -1.25 = -2.75 Simplifying (x) + -1.25 = -2.75 x + -1.25 = -2.75 Reorder the terms: -1.25 + x = -2.75 Solving -1.25 + x = -2.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -2.75 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.75 + 1.25 x = -2.75 + 1.25 Combine like terms: -2.75 + 1.25 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -1.5}

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