x^2-14x-161.25=0

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Solution for x^2-14x-161.25=0 equation:


Simplifying
x2 + -14x + -161.25 = 0

Reorder the terms:
-161.25 + -14x + x2 = 0

Solving
-161.25 + -14x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '161.25' to each side of the equation.
-161.25 + -14x + 161.25 + x2 = 0 + 161.25

Reorder the terms:
-161.25 + 161.25 + -14x + x2 = 0 + 161.25

Combine like terms: -161.25 + 161.25 = 0.00
0.00 + -14x + x2 = 0 + 161.25
-14x + x2 = 0 + 161.25

Combine like terms: 0 + 161.25 = 161.25
-14x + x2 = 161.25

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 = 161.25 + 49

Reorder the terms:
49 + -14x + x2 = 161.25 + 49

Combine like terms: 161.25 + 49 = 210.25
49 + -14x + x2 = 210.25

Factor a perfect square on the left side:
(x + -7)(x + -7) = 210.25

Calculate the square root of the right side: 14.5

Break this problem into two subproblems by setting 
(x + -7) equal to 14.5 and -14.5.

Subproblem 1

x + -7 = 14.5 Simplifying x + -7 = 14.5 Reorder the terms: -7 + x = 14.5 Solving -7 + x = 14.5 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 = 14.5 + 7 Combine like terms: -7 + 7 = 0 0 + x = 14.5 + 7 x = 14.5 + 7 Combine like terms: 14.5 + 7 = 21.5 x = 21.5 Simplifying x = 21.5

Subproblem 2

x + -7 = -14.5 Simplifying x + -7 = -14.5 Reorder the terms: -7 + x = -14.5 Solving -7 + x = -14.5 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 = -14.5 + 7 Combine like terms: -7 + 7 = 0 0 + x = -14.5 + 7 x = -14.5 + 7 Combine like terms: -14.5 + 7 = -7.5 x = -7.5 Simplifying x = -7.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.5, -7.5}

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