x^2-15.5x-35=0

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Solution for x^2-15.5x-35=0 equation:


Simplifying
x2 + -15.5x + -35 = 0

Reorder the terms:
-35 + -15.5x + x2 = 0

Solving
-35 + -15.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -15.5x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + -15.5x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -15.5x + x2 = 0 + 35
-15.5x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
-15.5x + x2 = 35

The x term is -15.5x.  Take half its coefficient (-7.75).
Square it (60.0625) and add it to both sides.

Add '60.0625' to each side of the equation.
-15.5x + 60.0625 + x2 = 35 + 60.0625

Reorder the terms:
60.0625 + -15.5x + x2 = 35 + 60.0625

Combine like terms: 35 + 60.0625 = 95.0625
60.0625 + -15.5x + x2 = 95.0625

Factor a perfect square on the left side:
(x + -7.75)(x + -7.75) = 95.0625

Calculate the square root of the right side: 9.75

Break this problem into two subproblems by setting 
(x + -7.75) equal to 9.75 and -9.75.

Subproblem 1

x + -7.75 = 9.75 Simplifying x + -7.75 = 9.75 Reorder the terms: -7.75 + x = 9.75 Solving -7.75 + x = 9.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.75' to each side of the equation. -7.75 + 7.75 + x = 9.75 + 7.75 Combine like terms: -7.75 + 7.75 = 0.00 0.00 + x = 9.75 + 7.75 x = 9.75 + 7.75 Combine like terms: 9.75 + 7.75 = 17.5 x = 17.5 Simplifying x = 17.5

Subproblem 2

x + -7.75 = -9.75 Simplifying x + -7.75 = -9.75 Reorder the terms: -7.75 + x = -9.75 Solving -7.75 + x = -9.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.75' to each side of the equation. -7.75 + 7.75 + x = -9.75 + 7.75 Combine like terms: -7.75 + 7.75 = 0.00 0.00 + x = -9.75 + 7.75 x = -9.75 + 7.75 Combine like terms: -9.75 + 7.75 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.5, -2}

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