(3x-2)(x+5)=10

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Solution for (3x-2)(x+5)=10 equation:


Simplifying
(3x + -2)(x + 5) = 10

Reorder the terms:
(-2 + 3x)(x + 5) = 10

Reorder the terms:
(-2 + 3x)(5 + x) = 10

Multiply (-2 + 3x) * (5 + x)
(-2(5 + x) + 3x * (5 + x)) = 10
((5 * -2 + x * -2) + 3x * (5 + x)) = 10
((-10 + -2x) + 3x * (5 + x)) = 10
(-10 + -2x + (5 * 3x + x * 3x)) = 10
(-10 + -2x + (15x + 3x2)) = 10

Combine like terms: -2x + 15x = 13x
(-10 + 13x + 3x2) = 10

Solving
-10 + 13x + 3x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + -10 + 13x + 3x2 = 10 + -10

Combine like terms: -10 + -10 = -20
-20 + 13x + 3x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-20 + 13x + 3x2 = 0

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

Divide each side by '3'.
-6.666666667 + 4.333333333x + x2 = 0

Move the constant term to the right:

Add '6.666666667' to each side of the equation.
-6.666666667 + 4.333333333x + 6.666666667 + x2 = 0 + 6.666666667

Reorder the terms:
-6.666666667 + 6.666666667 + 4.333333333x + x2 = 0 + 6.666666667

Combine like terms: -6.666666667 + 6.666666667 = 0.000000000
0.000000000 + 4.333333333x + x2 = 0 + 6.666666667
4.333333333x + x2 = 0 + 6.666666667

Combine like terms: 0 + 6.666666667 = 6.666666667
4.333333333x + x2 = 6.666666667

The x term is 4.333333333x.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333x + 4.694444446 + x2 = 6.666666667 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333x + x2 = 6.666666667 + 4.694444446

Combine like terms: 6.666666667 + 4.694444446 = 11.361111113
4.694444446 + 4.333333333x + x2 = 11.361111113

Factor a perfect square on the left side:
(x + 2.166666667)(x + 2.166666667) = 11.361111113

Calculate the square root of the right side: 3.370624736

Break this problem into two subproblems by setting 
(x + 2.166666667) equal to 3.370624736 and -3.370624736.

Subproblem 1

x + 2.166666667 = 3.370624736 Simplifying x + 2.166666667 = 3.370624736 Reorder the terms: 2.166666667 + x = 3.370624736 Solving 2.166666667 + x = 3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = 3.370624736 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = 3.370624736 + -2.166666667 x = 3.370624736 + -2.166666667 Combine like terms: 3.370624736 + -2.166666667 = 1.203958069 x = 1.203958069 Simplifying x = 1.203958069

Subproblem 2

x + 2.166666667 = -3.370624736 Simplifying x + 2.166666667 = -3.370624736 Reorder the terms: 2.166666667 + x = -3.370624736 Solving 2.166666667 + x = -3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = -3.370624736 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = -3.370624736 + -2.166666667 x = -3.370624736 + -2.166666667 Combine like terms: -3.370624736 + -2.166666667 = -5.537291403 x = -5.537291403 Simplifying x = -5.537291403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.203958069, -5.537291403}

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