x^2+17x+72=3

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Solution for x^2+17x+72=3 equation:


Simplifying
x2 + 17x + 72 = 3

Reorder the terms:
72 + 17x + x2 = 3

Solving
72 + 17x + x2 = 3

Solving for variable 'x'.

Reorder the terms:
72 + -3 + 17x + x2 = 3 + -3

Combine like terms: 72 + -3 = 69
69 + 17x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
69 + 17x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-69' to each side of the equation.
69 + 17x + -69 + x2 = 0 + -69

Reorder the terms:
69 + -69 + 17x + x2 = 0 + -69

Combine like terms: 69 + -69 = 0
0 + 17x + x2 = 0 + -69
17x + x2 = 0 + -69

Combine like terms: 0 + -69 = -69
17x + x2 = -69

The x term is 17x.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17x + 72.25 + x2 = -69 + 72.25

Reorder the terms:
72.25 + 17x + x2 = -69 + 72.25

Combine like terms: -69 + 72.25 = 3.25
72.25 + 17x + x2 = 3.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + 8.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

x + 8.5 = 1.802775638 Simplifying x + 8.5 = 1.802775638 Reorder the terms: 8.5 + x = 1.802775638 Solving 8.5 + x = 1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = 1.802775638 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 1.802775638 + -8.5 x = 1.802775638 + -8.5 Combine like terms: 1.802775638 + -8.5 = -6.697224362 x = -6.697224362 Simplifying x = -6.697224362

Subproblem 2

x + 8.5 = -1.802775638 Simplifying x + 8.5 = -1.802775638 Reorder the terms: 8.5 + x = -1.802775638 Solving 8.5 + x = -1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = -1.802775638 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -1.802775638 + -8.5 x = -1.802775638 + -8.5 Combine like terms: -1.802775638 + -8.5 = -10.302775638 x = -10.302775638 Simplifying x = -10.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-6.697224362, -10.302775638}

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