x*x+3x=15

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Solution for x*x+3x=15 equation:


Simplifying
x * x + 3x = 15

Multiply x * x
x2 + 3x = 15

Reorder the terms:
3x + x2 = 15

Solving
3x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 3x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 3x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 3x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 3x + x2 = 0 + 15
3x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
3x + x2 = 15

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 = 15 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 15 + 2.25

Combine like terms: 15 + 2.25 = 17.25
2.25 + 3x + x2 = 17.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 1.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 1.5 = 4.153311931 Simplifying x + 1.5 = 4.153311931 Reorder the terms: 1.5 + x = 4.153311931 Solving 1.5 + x = 4.153311931 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 = 4.153311931 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 4.153311931 + -1.5 x = 4.153311931 + -1.5 Combine like terms: 4.153311931 + -1.5 = 2.653311931 x = 2.653311931 Simplifying x = 2.653311931

Subproblem 2

x + 1.5 = -4.153311931 Simplifying x + 1.5 = -4.153311931 Reorder the terms: 1.5 + x = -4.153311931 Solving 1.5 + x = -4.153311931 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 = -4.153311931 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -4.153311931 + -1.5 x = -4.153311931 + -1.5 Combine like terms: -4.153311931 + -1.5 = -5.653311931 x = -5.653311931 Simplifying x = -5.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.653311931, -5.653311931}

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