x(2x+3)=5(2+3)

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Solution for x(2x+3)=5(2+3) equation:


Simplifying
x(2x + 3) = 5(2 + 3)

Reorder the terms:
x(3 + 2x) = 5(2 + 3)
(3 * x + 2x * x) = 5(2 + 3)
(3x + 2x2) = 5(2 + 3)

Combine like terms: 2 + 3 = 5
3x + 2x2 = 5(5)

Multiply 5 * 5
3x + 2x2 = 25

Solving
3x + 2x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 3x + 2x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 3x + 2x2 = 0

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

Divide each side by '2'.
-12.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 1.5x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 1.5x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 1.5x + x2 = 0 + 12.5
1.5x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
1.5x + x2 = 12.5

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 = 12.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 12.5 + 0.5625

Combine like terms: 12.5 + 0.5625 = 13.0625
0.5625 + 1.5x + x2 = 13.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 13.0625

Calculate the square root of the right side: 3.614208074

Break this problem into two subproblems by setting 
(x + 0.75) equal to 3.614208074 and -3.614208074.

Subproblem 1

x + 0.75 = 3.614208074 Simplifying x + 0.75 = 3.614208074 Reorder the terms: 0.75 + x = 3.614208074 Solving 0.75 + x = 3.614208074 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 = 3.614208074 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 3.614208074 + -0.75 x = 3.614208074 + -0.75 Combine like terms: 3.614208074 + -0.75 = 2.864208074 x = 2.864208074 Simplifying x = 2.864208074

Subproblem 2

x + 0.75 = -3.614208074 Simplifying x + 0.75 = -3.614208074 Reorder the terms: 0.75 + x = -3.614208074 Solving 0.75 + x = -3.614208074 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 = -3.614208074 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -3.614208074 + -0.75 x = -3.614208074 + -0.75 Combine like terms: -3.614208074 + -0.75 = -4.364208074 x = -4.364208074 Simplifying x = -4.364208074

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.864208074, -4.364208074}

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