0=-45+10x+x^2

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Solution for 0=-45+10x+x^2 equation:


Simplifying
0 = -45 + 10x + x2

Solving
0 = -45 + 10x + x2

Solving for variable 'x'.

Combine like terms: 0 + 45 = 45
45 + -10x + -1x2 = -45 + 10x + x2 + 45 + -10x + -1x2

Reorder the terms:
45 + -10x + -1x2 = -45 + 45 + 10x + -10x + x2 + -1x2

Combine like terms: -45 + 45 = 0
45 + -10x + -1x2 = 0 + 10x + -10x + x2 + -1x2
45 + -10x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
45 + -10x + -1x2 = 0 + x2 + -1x2
45 + -10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
45 + -10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-45 + 10x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 10x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 10x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 10x + x2 = 0 + 45
10x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
10x + x2 = 45

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 45 + 25

Reorder the terms:
25 + 10x + x2 = 45 + 25

Combine like terms: 45 + 25 = 70
25 + 10x + x2 = 70

Factor a perfect square on the left side:
(x + 5)(x + 5) = 70

Calculate the square root of the right side: 8.366600265

Break this problem into two subproblems by setting 
(x + 5) equal to 8.366600265 and -8.366600265.

Subproblem 1

x + 5 = 8.366600265 Simplifying x + 5 = 8.366600265 Reorder the terms: 5 + x = 8.366600265 Solving 5 + x = 8.366600265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 8.366600265 + -5 Combine like terms: 5 + -5 = 0 0 + x = 8.366600265 + -5 x = 8.366600265 + -5 Combine like terms: 8.366600265 + -5 = 3.366600265 x = 3.366600265 Simplifying x = 3.366600265

Subproblem 2

x + 5 = -8.366600265 Simplifying x + 5 = -8.366600265 Reorder the terms: 5 + x = -8.366600265 Solving 5 + x = -8.366600265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -8.366600265 + -5 Combine like terms: 5 + -5 = 0 0 + x = -8.366600265 + -5 x = -8.366600265 + -5 Combine like terms: -8.366600265 + -5 = -13.366600265 x = -13.366600265 Simplifying x = -13.366600265

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.366600265, -13.366600265}

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