78=.5x^2-12x+150

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Solution for 78=.5x^2-12x+150 equation:


Simplifying
78 = 0.5x2 + -12x + 150

Reorder the terms:
78 = 150 + -12x + 0.5x2

Solving
78 = 150 + -12x + 0.5x2

Solving for variable 'x'.

Combine like terms: 78 + -150 = -72
-72 + 12x + -0.5x2 = 150 + -12x + 0.5x2 + -150 + 12x + -0.5x2

Reorder the terms:
-72 + 12x + -0.5x2 = 150 + -150 + -12x + 12x + 0.5x2 + -0.5x2

Combine like terms: 150 + -150 = 0
-72 + 12x + -0.5x2 = 0 + -12x + 12x + 0.5x2 + -0.5x2
-72 + 12x + -0.5x2 = -12x + 12x + 0.5x2 + -0.5x2

Combine like terms: -12x + 12x = 0
-72 + 12x + -0.5x2 = 0 + 0.5x2 + -0.5x2
-72 + 12x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
-72 + 12x + -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'.
144 + -24x + x2 = 0

Move the constant term to the right:

Add '-144' to each side of the equation.
144 + -24x + -144 + x2 = 0 + -144

Reorder the terms:
144 + -144 + -24x + x2 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -24x + x2 = 0 + -144
-24x + x2 = 0 + -144

Combine like terms: 0 + -144 = -144
-24x + x2 = -144

The x term is -24x.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24x + 144 + x2 = -144 + 144

Reorder the terms:
144 + -24x + x2 = -144 + 144

Combine like terms: -144 + 144 = 0
144 + -24x + x2 = 0

Factor a perfect square on the left side:
(x + -12)(x + -12) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + -12) equal to 0 and 0.

Subproblem 1

x + -12 = 0 Simplifying x + -12 = 0 Reorder the terms: -12 + x = 0 Solving -12 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + x = 0 + 12 x = 0 + 12 Combine like terms: 0 + 12 = 12 x = 12 Simplifying x = 12

Subproblem 2

x + -12 = 0 Simplifying x + -12 = 0 Reorder the terms: -12 + x = 0 Solving -12 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + x = 0 + 12 x = 0 + 12 Combine like terms: 0 + 12 = 12 x = 12 Simplifying x = 12

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12, 12}

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