x(2x+3)=160

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Solution for x(2x+3)=160 equation:


Simplifying
x(2x + 3) = 160

Reorder the terms:
x(3 + 2x) = 160
(3 * x + 2x * x) = 160
(3x + 2x2) = 160

Solving
3x + 2x2 = 160

Solving for variable 'x'.

Reorder the terms:
-160 + 3x + 2x2 = 160 + -160

Combine like terms: 160 + -160 = 0
-160 + 3x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-80 + 1.5x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 1.5x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 1.5x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 1.5x + x2 = 0 + 80
1.5x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
1.5x + x2 = 80

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 80 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 80 + 0.5625

Combine like terms: 80 + 0.5625 = 80.5625
0.5625 + 1.5x + x2 = 80.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 80.5625

Calculate the square root of the right side: 8.975661536

Break this problem into two subproblems by setting 
(x + 0.75) equal to 8.975661536 and -8.975661536.

Subproblem 1

x + 0.75 = 8.975661536 Simplifying x + 0.75 = 8.975661536 Reorder the terms: 0.75 + x = 8.975661536 Solving 0.75 + x = 8.975661536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 8.975661536 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 8.975661536 + -0.75 x = 8.975661536 + -0.75 Combine like terms: 8.975661536 + -0.75 = 8.225661536 x = 8.225661536 Simplifying x = 8.225661536

Subproblem 2

x + 0.75 = -8.975661536 Simplifying x + 0.75 = -8.975661536 Reorder the terms: 0.75 + x = -8.975661536 Solving 0.75 + x = -8.975661536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -8.975661536 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -8.975661536 + -0.75 x = -8.975661536 + -0.75 Combine like terms: -8.975661536 + -0.75 = -9.725661536 x = -9.725661536 Simplifying x = -9.725661536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.225661536, -9.725661536}

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