(2x+3)(x+2)=30

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Solution for (2x+3)(x+2)=30 equation:


Simplifying
(2x + 3)(x + 2) = 30

Reorder the terms:
(3 + 2x)(x + 2) = 30

Reorder the terms:
(3 + 2x)(2 + x) = 30

Multiply (3 + 2x) * (2 + x)
(3(2 + x) + 2x * (2 + x)) = 30
((2 * 3 + x * 3) + 2x * (2 + x)) = 30
((6 + 3x) + 2x * (2 + x)) = 30
(6 + 3x + (2 * 2x + x * 2x)) = 30
(6 + 3x + (4x + 2x2)) = 30

Combine like terms: 3x + 4x = 7x
(6 + 7x + 2x2) = 30

Solving
6 + 7x + 2x2 = 30

Solving for variable 'x'.

Reorder the terms:
6 + -30 + 7x + 2x2 = 30 + -30

Combine like terms: 6 + -30 = -24
-24 + 7x + 2x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-24 + 7x + 2x2 = 0

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

Divide each side by '2'.
-12 + 3.5x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 3.5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 3.5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 3.5x + x2 = 0 + 12
3.5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
3.5x + x2 = 12

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 12 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 12 + 3.0625

Combine like terms: 12 + 3.0625 = 15.0625
3.0625 + 3.5x + x2 = 15.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.881043674 and -3.881043674.

Subproblem 1

x + 1.75 = 3.881043674 Simplifying x + 1.75 = 3.881043674 Reorder the terms: 1.75 + x = 3.881043674 Solving 1.75 + x = 3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 3.881043674 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.881043674 + -1.75 x = 3.881043674 + -1.75 Combine like terms: 3.881043674 + -1.75 = 2.131043674 x = 2.131043674 Simplifying x = 2.131043674

Subproblem 2

x + 1.75 = -3.881043674 Simplifying x + 1.75 = -3.881043674 Reorder the terms: 1.75 + x = -3.881043674 Solving 1.75 + x = -3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -3.881043674 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.881043674 + -1.75 x = -3.881043674 + -1.75 Combine like terms: -3.881043674 + -1.75 = -5.631043674 x = -5.631043674 Simplifying x = -5.631043674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.131043674, -5.631043674}

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