x*x+3x=25

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Solution for x*x+3x=25 equation:


Simplifying
x * x + 3x = 25

Multiply x * x
x2 + 3x = 25

Reorder the terms:
3x + x2 = 25

Solving
3x + x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 3x + x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 3x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 3x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 3x + x2 = 0 + 25
3x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
3x + x2 = 25

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 = 25 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 25 + 2.25

Combine like terms: 25 + 2.25 = 27.25
2.25 + 3x + x2 = 27.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 27.25

Calculate the square root of the right side: 5.220153254

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.220153254 and -5.220153254.

Subproblem 1

x + 1.5 = 5.220153254 Simplifying x + 1.5 = 5.220153254 Reorder the terms: 1.5 + x = 5.220153254 Solving 1.5 + x = 5.220153254 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 = 5.220153254 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.220153254 + -1.5 x = 5.220153254 + -1.5 Combine like terms: 5.220153254 + -1.5 = 3.720153254 x = 3.720153254 Simplifying x = 3.720153254

Subproblem 2

x + 1.5 = -5.220153254 Simplifying x + 1.5 = -5.220153254 Reorder the terms: 1.5 + x = -5.220153254 Solving 1.5 + x = -5.220153254 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 = -5.220153254 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.220153254 + -1.5 x = -5.220153254 + -1.5 Combine like terms: -5.220153254 + -1.5 = -6.720153254 x = -6.720153254 Simplifying x = -6.720153254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.720153254, -6.720153254}

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