x^2+3x=170

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Solution for x^2+3x=170 equation:


Simplifying
x2 + 3x = 170

Reorder the terms:
3x + x2 = 170

Solving
3x + x2 = 170

Solving for variable 'x'.

Reorder the terms:
-170 + 3x + x2 = 170 + -170

Combine like terms: 170 + -170 = 0
-170 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '170' to each side of the equation.
-170 + 3x + 170 + x2 = 0 + 170

Reorder the terms:
-170 + 170 + 3x + x2 = 0 + 170

Combine like terms: -170 + 170 = 0
0 + 3x + x2 = 0 + 170
3x + x2 = 0 + 170

Combine like terms: 0 + 170 = 170
3x + x2 = 170

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 170 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 170 + 2.25

Combine like terms: 170 + 2.25 = 172.25
2.25 + 3x + x2 = 172.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 172.25

Calculate the square root of the right side: 13.124404748

Break this problem into two subproblems by setting 
(x + 1.5) equal to 13.124404748 and -13.124404748.

Subproblem 1

x + 1.5 = 13.124404748 Simplifying x + 1.5 = 13.124404748 Reorder the terms: 1.5 + x = 13.124404748 Solving 1.5 + x = 13.124404748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 13.124404748 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 13.124404748 + -1.5 x = 13.124404748 + -1.5 Combine like terms: 13.124404748 + -1.5 = 11.624404748 x = 11.624404748 Simplifying x = 11.624404748

Subproblem 2

x + 1.5 = -13.124404748 Simplifying x + 1.5 = -13.124404748 Reorder the terms: 1.5 + x = -13.124404748 Solving 1.5 + x = -13.124404748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -13.124404748 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -13.124404748 + -1.5 x = -13.124404748 + -1.5 Combine like terms: -13.124404748 + -1.5 = -14.624404748 x = -14.624404748 Simplifying x = -14.624404748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.624404748, -14.624404748}

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