x^2+3x=177

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Solution for x^2+3x=177 equation:


Simplifying
x2 + 3x = 177

Reorder the terms:
3x + x2 = 177

Solving
3x + x2 = 177

Solving for variable 'x'.

Reorder the terms:
-177 + 3x + x2 = 177 + -177

Combine like terms: 177 + -177 = 0
-177 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '177' to each side of the equation.
-177 + 3x + 177 + x2 = 0 + 177

Reorder the terms:
-177 + 177 + 3x + x2 = 0 + 177

Combine like terms: -177 + 177 = 0
0 + 3x + x2 = 0 + 177
3x + x2 = 0 + 177

Combine like terms: 0 + 177 = 177
3x + x2 = 177

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 = 177 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 177 + 2.25

Combine like terms: 177 + 2.25 = 179.25
2.25 + 3x + x2 = 179.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 179.25

Calculate the square root of the right side: 13.388427839

Break this problem into two subproblems by setting 
(x + 1.5) equal to 13.388427839 and -13.388427839.

Subproblem 1

x + 1.5 = 13.388427839 Simplifying x + 1.5 = 13.388427839 Reorder the terms: 1.5 + x = 13.388427839 Solving 1.5 + x = 13.388427839 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 = 13.388427839 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 13.388427839 + -1.5 x = 13.388427839 + -1.5 Combine like terms: 13.388427839 + -1.5 = 11.888427839 x = 11.888427839 Simplifying x = 11.888427839

Subproblem 2

x + 1.5 = -13.388427839 Simplifying x + 1.5 = -13.388427839 Reorder the terms: 1.5 + x = -13.388427839 Solving 1.5 + x = -13.388427839 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 = -13.388427839 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -13.388427839 + -1.5 x = -13.388427839 + -1.5 Combine like terms: -13.388427839 + -1.5 = -14.888427839 x = -14.888427839 Simplifying x = -14.888427839

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.888427839, -14.888427839}

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