x^2+3x=50

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Solution for x^2+3x=50 equation:


Simplifying
x2 + 3x = 50

Reorder the terms:
3x + x2 = 50

Solving
3x + x2 = 50

Solving for variable 'x'.

Reorder the terms:
-50 + 3x + x2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 3x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + 3x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 3x + x2 = 0 + 50
3x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
3x + x2 = 50

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 = 50 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 50 + 2.25

Combine like terms: 50 + 2.25 = 52.25
2.25 + 3x + x2 = 52.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 52.25

Calculate the square root of the right side: 7.228416147

Break this problem into two subproblems by setting 
(x + 1.5) equal to 7.228416147 and -7.228416147.

Subproblem 1

x + 1.5 = 7.228416147 Simplifying x + 1.5 = 7.228416147 Reorder the terms: 1.5 + x = 7.228416147 Solving 1.5 + x = 7.228416147 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 = 7.228416147 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 7.228416147 + -1.5 x = 7.228416147 + -1.5 Combine like terms: 7.228416147 + -1.5 = 5.728416147 x = 5.728416147 Simplifying x = 5.728416147

Subproblem 2

x + 1.5 = -7.228416147 Simplifying x + 1.5 = -7.228416147 Reorder the terms: 1.5 + x = -7.228416147 Solving 1.5 + x = -7.228416147 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 = -7.228416147 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -7.228416147 + -1.5 x = -7.228416147 + -1.5 Combine like terms: -7.228416147 + -1.5 = -8.728416147 x = -8.728416147 Simplifying x = -8.728416147

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.728416147, -8.728416147}

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