2=-.5x^2+7x-8

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Solution for 2=-.5x^2+7x-8 equation:


Simplifying
2 = -0.5x2 + 7x + -8

Reorder the terms:
2 = -8 + 7x + -0.5x2

Solving
2 = -8 + 7x + -0.5x2

Solving for variable 'x'.

Combine like terms: 2 + 8 = 10
10 + -7x + 0.5x2 = -8 + 7x + -0.5x2 + 8 + -7x + 0.5x2

Reorder the terms:
10 + -7x + 0.5x2 = -8 + 8 + 7x + -7x + -0.5x2 + 0.5x2

Combine like terms: -8 + 8 = 0
10 + -7x + 0.5x2 = 0 + 7x + -7x + -0.5x2 + 0.5x2
10 + -7x + 0.5x2 = 7x + -7x + -0.5x2 + 0.5x2

Combine like terms: 7x + -7x = 0
10 + -7x + 0.5x2 = 0 + -0.5x2 + 0.5x2
10 + -7x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
10 + -7x + 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'.
20 + -14x + x2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -14x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + -14x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -14x + x2 = 0 + -20
-14x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-14x + x2 = -20

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = -20 + 49

Reorder the terms:
49 + -14x + x2 = -20 + 49

Combine like terms: -20 + 49 = 29
49 + -14x + x2 = 29

Factor a perfect square on the left side:
(x + -7)(x + -7) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(x + -7) equal to 5.385164807 and -5.385164807.

Subproblem 1

x + -7 = 5.385164807 Simplifying x + -7 = 5.385164807 Reorder the terms: -7 + x = 5.385164807 Solving -7 + x = 5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 5.385164807 + 7 Combine like terms: -7 + 7 = 0 0 + x = 5.385164807 + 7 x = 5.385164807 + 7 Combine like terms: 5.385164807 + 7 = 12.385164807 x = 12.385164807 Simplifying x = 12.385164807

Subproblem 2

x + -7 = -5.385164807 Simplifying x + -7 = -5.385164807 Reorder the terms: -7 + x = -5.385164807 Solving -7 + x = -5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -5.385164807 + 7 Combine like terms: -7 + 7 = 0 0 + x = -5.385164807 + 7 x = -5.385164807 + 7 Combine like terms: -5.385164807 + 7 = 1.614835193 x = 1.614835193 Simplifying x = 1.614835193

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.385164807, 1.614835193}

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