(x)=x^2+10x-75

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Solution for (x)=x^2+10x-75 equation:


Simplifying
(x) = x2 + 10x + -75
x = x2 + 10x + -75

Reorder the terms:
x = -75 + 10x + x2

Solving
x = -75 + 10x + x2

Solving for variable 'x'.

Reorder the terms:
75 + x + -10x + -1x2 = -75 + 10x + x2 + 75 + -10x + -1x2

Combine like terms: x + -10x = -9x
75 + -9x + -1x2 = -75 + 10x + x2 + 75 + -10x + -1x2

Reorder the terms:
75 + -9x + -1x2 = -75 + 75 + 10x + -10x + x2 + -1x2

Combine like terms: -75 + 75 = 0
75 + -9x + -1x2 = 0 + 10x + -10x + x2 + -1x2
75 + -9x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
75 + -9x + -1x2 = 0 + x2 + -1x2
75 + -9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
75 + -9x + -1x2 = 0

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

Divide each side by '-1'.
-75 + 9x + x2 = 0

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 9x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 9x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 9x + x2 = 0 + 75
9x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
9x + x2 = 75

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 75 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 75 + 20.25

Combine like terms: 75 + 20.25 = 95.25
20.25 + 9x + x2 = 95.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 95.25

Calculate the square root of the right side: 9.759610648

Break this problem into two subproblems by setting 
(x + 4.5) equal to 9.759610648 and -9.759610648.

Subproblem 1

x + 4.5 = 9.759610648 Simplifying x + 4.5 = 9.759610648 Reorder the terms: 4.5 + x = 9.759610648 Solving 4.5 + x = 9.759610648 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 9.759610648 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 9.759610648 + -4.5 x = 9.759610648 + -4.5 Combine like terms: 9.759610648 + -4.5 = 5.259610648 x = 5.259610648 Simplifying x = 5.259610648

Subproblem 2

x + 4.5 = -9.759610648 Simplifying x + 4.5 = -9.759610648 Reorder the terms: 4.5 + x = -9.759610648 Solving 4.5 + x = -9.759610648 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -9.759610648 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -9.759610648 + -4.5 x = -9.759610648 + -4.5 Combine like terms: -9.759610648 + -4.5 = -14.259610648 x = -14.259610648 Simplifying x = -14.259610648

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.259610648, -14.259610648}

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