x^2+3x=51

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Solution for x^2+3x=51 equation:


Simplifying
x2 + 3x = 51

Reorder the terms:
3x + x2 = 51

Solving
3x + x2 = 51

Solving for variable 'x'.

Reorder the terms:
-51 + 3x + x2 = 51 + -51

Combine like terms: 51 + -51 = 0
-51 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + 3x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + 3x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + 3x + x2 = 0 + 51
3x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
3x + x2 = 51

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 = 51 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 51 + 2.25

Combine like terms: 51 + 2.25 = 53.25
2.25 + 3x + x2 = 53.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 53.25

Calculate the square root of the right side: 7.29725976

Break this problem into two subproblems by setting 
(x + 1.5) equal to 7.29725976 and -7.29725976.

Subproblem 1

x + 1.5 = 7.29725976 Simplifying x + 1.5 = 7.29725976 Reorder the terms: 1.5 + x = 7.29725976 Solving 1.5 + x = 7.29725976 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 = 7.29725976 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 7.29725976 + -1.5 x = 7.29725976 + -1.5 Combine like terms: 7.29725976 + -1.5 = 5.79725976 x = 5.79725976 Simplifying x = 5.79725976

Subproblem 2

x + 1.5 = -7.29725976 Simplifying x + 1.5 = -7.29725976 Reorder the terms: 1.5 + x = -7.29725976 Solving 1.5 + x = -7.29725976 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 = -7.29725976 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -7.29725976 + -1.5 x = -7.29725976 + -1.5 Combine like terms: -7.29725976 + -1.5 = -8.79725976 x = -8.79725976 Simplifying x = -8.79725976

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.79725976, -8.79725976}

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