x^2+3x=145

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Solution for x^2+3x=145 equation:


Simplifying
x2 + 3x = 145

Reorder the terms:
3x + x2 = 145

Solving
3x + x2 = 145

Solving for variable 'x'.

Reorder the terms:
-145 + 3x + x2 = 145 + -145

Combine like terms: 145 + -145 = 0
-145 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '145' to each side of the equation.
-145 + 3x + 145 + x2 = 0 + 145

Reorder the terms:
-145 + 145 + 3x + x2 = 0 + 145

Combine like terms: -145 + 145 = 0
0 + 3x + x2 = 0 + 145
3x + x2 = 0 + 145

Combine like terms: 0 + 145 = 145
3x + x2 = 145

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 = 145 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 145 + 2.25

Combine like terms: 145 + 2.25 = 147.25
2.25 + 3x + x2 = 147.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 147.25

Calculate the square root of the right side: 12.1346611

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.1346611 and -12.1346611.

Subproblem 1

x + 1.5 = 12.1346611 Simplifying x + 1.5 = 12.1346611 Reorder the terms: 1.5 + x = 12.1346611 Solving 1.5 + x = 12.1346611 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 = 12.1346611 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.1346611 + -1.5 x = 12.1346611 + -1.5 Combine like terms: 12.1346611 + -1.5 = 10.6346611 x = 10.6346611 Simplifying x = 10.6346611

Subproblem 2

x + 1.5 = -12.1346611 Simplifying x + 1.5 = -12.1346611 Reorder the terms: 1.5 + x = -12.1346611 Solving 1.5 + x = -12.1346611 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 = -12.1346611 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.1346611 + -1.5 x = -12.1346611 + -1.5 Combine like terms: -12.1346611 + -1.5 = -13.6346611 x = -13.6346611 Simplifying x = -13.6346611

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.6346611, -13.6346611}

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