x^2-28x-98=0

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Solution for x^2-28x-98=0 equation:


Simplifying
x2 + -28x + -98 = 0

Reorder the terms:
-98 + -28x + x2 = 0

Solving
-98 + -28x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + -28x + 98 + x2 = 0 + 98

Reorder the terms:
-98 + 98 + -28x + x2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + -28x + x2 = 0 + 98
-28x + x2 = 0 + 98

Combine like terms: 0 + 98 = 98
-28x + x2 = 98

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 98 + 196

Reorder the terms:
196 + -28x + x2 = 98 + 196

Combine like terms: 98 + 196 = 294
196 + -28x + x2 = 294

Factor a perfect square on the left side:
(x + -14)(x + -14) = 294

Calculate the square root of the right side: 17.146428199

Break this problem into two subproblems by setting 
(x + -14) equal to 17.146428199 and -17.146428199.

Subproblem 1

x + -14 = 17.146428199 Simplifying x + -14 = 17.146428199 Reorder the terms: -14 + x = 17.146428199 Solving -14 + x = 17.146428199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 17.146428199 + 14 Combine like terms: -14 + 14 = 0 0 + x = 17.146428199 + 14 x = 17.146428199 + 14 Combine like terms: 17.146428199 + 14 = 31.146428199 x = 31.146428199 Simplifying x = 31.146428199

Subproblem 2

x + -14 = -17.146428199 Simplifying x + -14 = -17.146428199 Reorder the terms: -14 + x = -17.146428199 Solving -14 + x = -17.146428199 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -17.146428199 + 14 Combine like terms: -14 + 14 = 0 0 + x = -17.146428199 + 14 x = -17.146428199 + 14 Combine like terms: -17.146428199 + 14 = -3.146428199 x = -3.146428199 Simplifying x = -3.146428199

Solution

The solution to the problem is based on the solutions from the subproblems. x = {31.146428199, -3.146428199}

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