x(x+3)=151

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Solution for x(x+3)=151 equation:


Simplifying
x(x + 3) = 151

Reorder the terms:
x(3 + x) = 151
(3 * x + x * x) = 151
(3x + x2) = 151

Solving
3x + x2 = 151

Solving for variable 'x'.

Reorder the terms:
-151 + 3x + x2 = 151 + -151

Combine like terms: 151 + -151 = 0
-151 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '151' to each side of the equation.
-151 + 3x + 151 + x2 = 0 + 151

Reorder the terms:
-151 + 151 + 3x + x2 = 0 + 151

Combine like terms: -151 + 151 = 0
0 + 3x + x2 = 0 + 151
3x + x2 = 0 + 151

Combine like terms: 0 + 151 = 151
3x + x2 = 151

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 = 151 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 151 + 2.25

Combine like terms: 151 + 2.25 = 153.25
2.25 + 3x + x2 = 153.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 153.25

Calculate the square root of the right side: 12.379418403

Break this problem into two subproblems by setting 
(x + 1.5) equal to 12.379418403 and -12.379418403.

Subproblem 1

x + 1.5 = 12.379418403 Simplifying x + 1.5 = 12.379418403 Reorder the terms: 1.5 + x = 12.379418403 Solving 1.5 + x = 12.379418403 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 = 12.379418403 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 12.379418403 + -1.5 x = 12.379418403 + -1.5 Combine like terms: 12.379418403 + -1.5 = 10.879418403 x = 10.879418403 Simplifying x = 10.879418403

Subproblem 2

x + 1.5 = -12.379418403 Simplifying x + 1.5 = -12.379418403 Reorder the terms: 1.5 + x = -12.379418403 Solving 1.5 + x = -12.379418403 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 = -12.379418403 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -12.379418403 + -1.5 x = -12.379418403 + -1.5 Combine like terms: -12.379418403 + -1.5 = -13.879418403 x = -13.879418403 Simplifying x = -13.879418403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.879418403, -13.879418403}

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