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

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


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

Reorder the terms:
3x(-5 + x) = 2x + 10
(-5 * 3x + x * 3x) = 2x + 10
(-15x + 3x2) = 2x + 10

Reorder the terms:
-15x + 3x2 = 10 + 2x

Solving
-15x + 3x2 = 10 + 2x

Solving for variable 'x'.

Reorder the terms:
-10 + -15x + -2x + 3x2 = 10 + 2x + -10 + -2x

Combine like terms: -15x + -2x = -17x
-10 + -17x + 3x2 = 10 + 2x + -10 + -2x

Reorder the terms:
-10 + -17x + 3x2 = 10 + -10 + 2x + -2x

Combine like terms: 10 + -10 = 0
-10 + -17x + 3x2 = 0 + 2x + -2x
-10 + -17x + 3x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-10 + -17x + 3x2 = 0

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

Divide each side by '3'.
-3.333333333 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -5.666666667x + 3.333333333 + x2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -5.666666667x + x2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -5.666666667x + x2 = 0 + 3.333333333
-5.666666667x + x2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-5.666666667x + x2 = 3.333333333

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = 3.333333333 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = 3.333333333 + 8.027777782

Combine like terms: 3.333333333 + 8.027777782 = 11.361111115
8.027777782 + -5.666666667x + x2 = 11.361111115

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 11.361111115

Calculate the square root of the right side: 3.370624737

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 3.370624737 and -3.370624737.

Subproblem 1

x + -2.833333334 = 3.370624737 Simplifying x + -2.833333334 = 3.370624737 Reorder the terms: -2.833333334 + x = 3.370624737 Solving -2.833333334 + x = 3.370624737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 3.370624737 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 3.370624737 + 2.833333334 x = 3.370624737 + 2.833333334 Combine like terms: 3.370624737 + 2.833333334 = 6.203958071 x = 6.203958071 Simplifying x = 6.203958071

Subproblem 2

x + -2.833333334 = -3.370624737 Simplifying x + -2.833333334 = -3.370624737 Reorder the terms: -2.833333334 + x = -3.370624737 Solving -2.833333334 + x = -3.370624737 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -3.370624737 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -3.370624737 + 2.833333334 x = -3.370624737 + 2.833333334 Combine like terms: -3.370624737 + 2.833333334 = -0.537291403 x = -0.537291403 Simplifying x = -0.537291403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.203958071, -0.537291403}

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