x^2+9x+36=75

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Solution for x^2+9x+36=75 equation:


Simplifying
x2 + 9x + 36 = 75

Reorder the terms:
36 + 9x + x2 = 75

Solving
36 + 9x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
36 + -75 + 9x + x2 = 75 + -75

Combine like terms: 36 + -75 = -39
-39 + 9x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-39 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 9x + 39 + x2 = 0 + 39

Reorder the terms:
-39 + 39 + 9x + x2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 9x + x2 = 0 + 39
9x + x2 = 0 + 39

Combine like terms: 0 + 39 = 39
9x + x2 = 39

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 = 39 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 39 + 20.25

Combine like terms: 39 + 20.25 = 59.25
20.25 + 9x + x2 = 59.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 59.25

Calculate the square root of the right side: 7.697402159

Break this problem into two subproblems by setting 
(x + 4.5) equal to 7.697402159 and -7.697402159.

Subproblem 1

x + 4.5 = 7.697402159 Simplifying x + 4.5 = 7.697402159 Reorder the terms: 4.5 + x = 7.697402159 Solving 4.5 + x = 7.697402159 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 = 7.697402159 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 7.697402159 + -4.5 x = 7.697402159 + -4.5 Combine like terms: 7.697402159 + -4.5 = 3.197402159 x = 3.197402159 Simplifying x = 3.197402159

Subproblem 2

x + 4.5 = -7.697402159 Simplifying x + 4.5 = -7.697402159 Reorder the terms: 4.5 + x = -7.697402159 Solving 4.5 + x = -7.697402159 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 = -7.697402159 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -7.697402159 + -4.5 x = -7.697402159 + -4.5 Combine like terms: -7.697402159 + -4.5 = -12.197402159 x = -12.197402159 Simplifying x = -12.197402159

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.197402159, -12.197402159}

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