x*(x+3)=143

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Solution for x*(x+3)=143 equation:


Simplifying
x(x + 3) = 143

Reorder the terms:
x(3 + x) = 143
(3 * x + x * x) = 143
(3x + x2) = 143

Solving
3x + x2 = 143

Solving for variable 'x'.

Reorder the terms:
-143 + 3x + x2 = 143 + -143

Combine like terms: 143 + -143 = 0
-143 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '143' to each side of the equation.
-143 + 3x + 143 + x2 = 0 + 143

Reorder the terms:
-143 + 143 + 3x + x2 = 0 + 143

Combine like terms: -143 + 143 = 0
0 + 3x + x2 = 0 + 143
3x + x2 = 0 + 143

Combine like terms: 0 + 143 = 143
3x + x2 = 143

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 = 143 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 143 + 2.25

Combine like terms: 143 + 2.25 = 145.25
2.25 + 3x + x2 = 145.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 145.25

Calculate the square root of the right side: 12.051970793

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.051970793 and -12.051970793.

Subproblem 1

x + 1.5 = 12.051970793 Simplifying x + 1.5 = 12.051970793 Reorder the terms: 1.5 + x = 12.051970793 Solving 1.5 + x = 12.051970793 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 = 12.051970793 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.051970793 + -1.5 x = 12.051970793 + -1.5 Combine like terms: 12.051970793 + -1.5 = 10.551970793 x = 10.551970793 Simplifying x = 10.551970793

Subproblem 2

x + 1.5 = -12.051970793 Simplifying x + 1.5 = -12.051970793 Reorder the terms: 1.5 + x = -12.051970793 Solving 1.5 + x = -12.051970793 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 = -12.051970793 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.051970793 + -1.5 x = -12.051970793 + -1.5 Combine like terms: -12.051970793 + -1.5 = -13.551970793 x = -13.551970793 Simplifying x = -13.551970793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.551970793, -13.551970793}

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