.75x^2-6x-56=.5x^2-1x

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Solution for .75x^2-6x-56=.5x^2-1x equation:


Simplifying
0.75x2 + -6x + -56 = 0.5x2 + -1x

Reorder the terms:
-56 + -6x + 0.75x2 = 0.5x2 + -1x

Reorder the terms:
-56 + -6x + 0.75x2 = -1x + 0.5x2

Solving
-56 + -6x + 0.75x2 = -1x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
-56 + -6x + x + 0.75x2 + -0.5x2 = -1x + 0.5x2 + x + -0.5x2

Combine like terms: -6x + x = -5x
-56 + -5x + 0.75x2 + -0.5x2 = -1x + 0.5x2 + x + -0.5x2

Combine like terms: 0.75x2 + -0.5x2 = 0.25x2
-56 + -5x + 0.25x2 = -1x + 0.5x2 + x + -0.5x2

Reorder the terms:
-56 + -5x + 0.25x2 = -1x + x + 0.5x2 + -0.5x2

Combine like terms: -1x + x = 0
-56 + -5x + 0.25x2 = 0 + 0.5x2 + -0.5x2
-56 + -5x + 0.25x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
-56 + -5x + 0.25x2 = 0.0

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

Divide each side by '0.25'.
-224 + -20x + x2 = 0

Move the constant term to the right:

Add '224' to each side of the equation.
-224 + -20x + 224 + x2 = 0 + 224

Reorder the terms:
-224 + 224 + -20x + x2 = 0 + 224

Combine like terms: -224 + 224 = 0
0 + -20x + x2 = 0 + 224
-20x + x2 = 0 + 224

Combine like terms: 0 + 224 = 224
-20x + x2 = 224

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 224 + 100

Reorder the terms:
100 + -20x + x2 = 224 + 100

Combine like terms: 224 + 100 = 324
100 + -20x + x2 = 324

Factor a perfect square on the left side:
(x + -10)(x + -10) = 324

Calculate the square root of the right side: 18

Break this problem into two subproblems by setting 
(x + -10) equal to 18 and -18.

Subproblem 1

x + -10 = 18 Simplifying x + -10 = 18 Reorder the terms: -10 + x = 18 Solving -10 + x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 18 + 10 Combine like terms: -10 + 10 = 0 0 + x = 18 + 10 x = 18 + 10 Combine like terms: 18 + 10 = 28 x = 28 Simplifying x = 28

Subproblem 2

x + -10 = -18 Simplifying x + -10 = -18 Reorder the terms: -10 + x = -18 Solving -10 + x = -18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -18 + 10 Combine like terms: -10 + 10 = 0 0 + x = -18 + 10 x = -18 + 10 Combine like terms: -18 + 10 = -8 x = -8 Simplifying x = -8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28, -8}

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