x(x+3)=175

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Solution for x(x+3)=175 equation:


Simplifying
x(x + 3) = 175

Reorder the terms:
x(3 + x) = 175
(3 * x + x * x) = 175
(3x + x2) = 175

Solving
3x + x2 = 175

Solving for variable 'x'.

Reorder the terms:
-175 + 3x + x2 = 175 + -175

Combine like terms: 175 + -175 = 0
-175 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '175' to each side of the equation.
-175 + 3x + 175 + x2 = 0 + 175

Reorder the terms:
-175 + 175 + 3x + x2 = 0 + 175

Combine like terms: -175 + 175 = 0
0 + 3x + x2 = 0 + 175
3x + x2 = 0 + 175

Combine like terms: 0 + 175 = 175
3x + x2 = 175

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 = 175 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 175 + 2.25

Combine like terms: 175 + 2.25 = 177.25
2.25 + 3x + x2 = 177.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 177.25

Calculate the square root of the right side: 13.313526956

Break this problem into two subproblems by setting 
(x + 1.5) equal to 13.313526956 and -13.313526956.

Subproblem 1

x + 1.5 = 13.313526956 Simplifying x + 1.5 = 13.313526956 Reorder the terms: 1.5 + x = 13.313526956 Solving 1.5 + x = 13.313526956 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 = 13.313526956 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 13.313526956 + -1.5 x = 13.313526956 + -1.5 Combine like terms: 13.313526956 + -1.5 = 11.813526956 x = 11.813526956 Simplifying x = 11.813526956

Subproblem 2

x + 1.5 = -13.313526956 Simplifying x + 1.5 = -13.313526956 Reorder the terms: 1.5 + x = -13.313526956 Solving 1.5 + x = -13.313526956 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 = -13.313526956 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -13.313526956 + -1.5 x = -13.313526956 + -1.5 Combine like terms: -13.313526956 + -1.5 = -14.813526956 x = -14.813526956 Simplifying x = -14.813526956

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.813526956, -14.813526956}

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