3x(2x+7)=30

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Solution for 3x(2x+7)=30 equation: 


Simplifying
3x(2x + 7) = 30

Reorder the terms:
3x(7 + 2x) = 30
(7 * 3x + 2x * 3x) = 30
(21x + 6x2) = 30

Solving
21x + 6x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + 21x + 6x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 21x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-10 + 7x + 2x2) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-10 + 7x + 2x2)' equal to zero and attempt to solve:

Simplifying
-10 + 7x + 2x2 = 0

Solving
-10 + 7x + 2x2 = 0

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

Divide each side by '2'.
-5 + 3.5x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 3.5x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 3.5x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 3.5x + x2 = 0 + 5
3.5x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
3.5x + x2 = 5

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 = 5 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 5 + 3.0625

Combine like terms: 5 + 3.0625 = 8.0625
3.0625 + 3.5x + x2 = 8.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 8.0625

Calculate the square root of the right side: 2.839454173

Break this problem into two subproblems by setting 
(x + 1.75) equal to 2.839454173 and -2.839454173.


Subproblem 1
x + 1.75 = 2.839454173

Simplifying
x + 1.75 = 2.839454173

Reorder the terms:
1.75 + x = 2.839454173

Solving
1.75 + x = 2.839454173

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 = 2.839454173 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + x = 2.839454173 + -1.75
x = 2.839454173 + -1.75

Combine like terms: 2.839454173 + -1.75 = 1.089454173
x = 1.089454173

Simplifying
x = 1.089454173


Subproblem 2
x + 1.75 = -2.839454173

Simplifying
x + 1.75 = -2.839454173

Reorder the terms:
1.75 + x = -2.839454173

Solving
1.75 + x = -2.839454173

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 = -2.839454173 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + x = -2.839454173 + -1.75
x = -2.839454173 + -1.75

Combine like terms: -2.839454173 + -1.75 = -4.589454173
x = -4.589454173

Simplifying
x = -4.589454173


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.089454173, -4.589454173}
Solution
x = {1.089454173, -4.589454173}

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