0.5x^2+4116=91x

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Solution for 0.5x^2+4116=91x equation:


Simplifying
0.5x2 + 4116 = 91x

Reorder the terms:
4116 + 0.5x2 = 91x

Solving
4116 + 0.5x2 = 91x

Solving for variable 'x'.

Reorder the terms:
4116 + -91x + 0.5x2 = 91x + -91x

Combine like terms: 91x + -91x = 0
4116 + -91x + 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'.
8232 + -182x + x2 = 0

Move the constant term to the right:

Add '-8232' to each side of the equation.
8232 + -182x + -8232 + x2 = 0 + -8232

Reorder the terms:
8232 + -8232 + -182x + x2 = 0 + -8232

Combine like terms: 8232 + -8232 = 0
0 + -182x + x2 = 0 + -8232
-182x + x2 = 0 + -8232

Combine like terms: 0 + -8232 = -8232
-182x + x2 = -8232

The x term is -182x.  Take half its coefficient (-91).
Square it (8281) and add it to both sides.

Add '8281' to each side of the equation.
-182x + 8281 + x2 = -8232 + 8281

Reorder the terms:
8281 + -182x + x2 = -8232 + 8281

Combine like terms: -8232 + 8281 = 49
8281 + -182x + x2 = 49

Factor a perfect square on the left side:
(x + -91)(x + -91) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + -91) equal to 7 and -7.

Subproblem 1

x + -91 = 7 Simplifying x + -91 = 7 Reorder the terms: -91 + x = 7 Solving -91 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '91' to each side of the equation. -91 + 91 + x = 7 + 91 Combine like terms: -91 + 91 = 0 0 + x = 7 + 91 x = 7 + 91 Combine like terms: 7 + 91 = 98 x = 98 Simplifying x = 98

Subproblem 2

x + -91 = -7 Simplifying x + -91 = -7 Reorder the terms: -91 + x = -7 Solving -91 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '91' to each side of the equation. -91 + 91 + x = -7 + 91 Combine like terms: -91 + 91 = 0 0 + x = -7 + 91 x = -7 + 91 Combine like terms: -7 + 91 = 84 x = 84 Simplifying x = 84

Solution

The solution to the problem is based on the solutions from the subproblems. x = {98, 84}

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