3x(x-5)+4(3-2x)=

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Solution for 3x(x-5)+4(3-2x)= equation:


Simplifying
3x(x + -5) + 4(3 + -2x) = 0

Reorder the terms:
3x(-5 + x) + 4(3 + -2x) = 0
(-5 * 3x + x * 3x) + 4(3 + -2x) = 0
(-15x + 3x2) + 4(3 + -2x) = 0
-15x + 3x2 + (3 * 4 + -2x * 4) = 0
-15x + 3x2 + (12 + -8x) = 0

Reorder the terms:
12 + -15x + -8x + 3x2 = 0

Combine like terms: -15x + -8x = -23x
12 + -23x + 3x2 = 0

Solving
12 + -23x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
4 + -7.666666667x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -7.666666667x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -7.666666667x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -7.666666667x + x2 = 0 + -4
-7.666666667x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-7.666666667x + x2 = -4

The x term is -7.666666667x.  Take half its coefficient (-3.833333334).
Square it (14.69444445) and add it to both sides.

Add '14.69444445' to each side of the equation.
-7.666666667x + 14.69444445 + x2 = -4 + 14.69444445

Reorder the terms:
14.69444445 + -7.666666667x + x2 = -4 + 14.69444445

Combine like terms: -4 + 14.69444445 = 10.69444445
14.69444445 + -7.666666667x + x2 = 10.69444445

Factor a perfect square on the left side:
(x + -3.833333334)(x + -3.833333334) = 10.69444445

Calculate the square root of the right side: 3.270236146

Break this problem into two subproblems by setting 
(x + -3.833333334) equal to 3.270236146 and -3.270236146.

Subproblem 1

x + -3.833333334 = 3.270236146 Simplifying x + -3.833333334 = 3.270236146 Reorder the terms: -3.833333334 + x = 3.270236146 Solving -3.833333334 + x = 3.270236146 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + x = 3.270236146 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + x = 3.270236146 + 3.833333334 x = 3.270236146 + 3.833333334 Combine like terms: 3.270236146 + 3.833333334 = 7.10356948 x = 7.10356948 Simplifying x = 7.10356948

Subproblem 2

x + -3.833333334 = -3.270236146 Simplifying x + -3.833333334 = -3.270236146 Reorder the terms: -3.833333334 + x = -3.270236146 Solving -3.833333334 + x = -3.270236146 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + x = -3.270236146 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + x = -3.270236146 + 3.833333334 x = -3.270236146 + 3.833333334 Combine like terms: -3.270236146 + 3.833333334 = 0.563097188 x = 0.563097188 Simplifying x = 0.563097188

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.10356948, 0.563097188}

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