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

Simple and best practice solution for 3x(x-4)(x+2)=3x^3-5 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

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


Simplifying
3x(x + -4)(x + 2) = 3x3 + -5

Reorder the terms:
3x(-4 + x)(x + 2) = 3x3 + -5

Reorder the terms:
3x(-4 + x)(2 + x) = 3x3 + -5

Multiply (-4 + x) * (2 + x)
3x(-4(2 + x) + x(2 + x)) = 3x3 + -5
3x((2 * -4 + x * -4) + x(2 + x)) = 3x3 + -5
3x((-8 + -4x) + x(2 + x)) = 3x3 + -5
3x(-8 + -4x + (2 * x + x * x)) = 3x3 + -5
3x(-8 + -4x + (2x + x2)) = 3x3 + -5

Combine like terms: -4x + 2x = -2x
3x(-8 + -2x + x2) = 3x3 + -5
(-8 * 3x + -2x * 3x + x2 * 3x) = 3x3 + -5
(-24x + -6x2 + 3x3) = 3x3 + -5

Reorder the terms:
-24x + -6x2 + 3x3 = -5 + 3x3

Add '-3x3' to each side of the equation.
-24x + -6x2 + 3x3 + -3x3 = -5 + 3x3 + -3x3

Combine like terms: 3x3 + -3x3 = 0
-24x + -6x2 + 0 = -5 + 3x3 + -3x3
-24x + -6x2 = -5 + 3x3 + -3x3

Combine like terms: 3x3 + -3x3 = 0
-24x + -6x2 = -5 + 0
-24x + -6x2 = -5

Solving
-24x + -6x2 = -5

Solving for variable 'x'.

Reorder the terms:
5 + -24x + -6x2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + -24x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-0.8333333333 + 4x + x2 = 0

Move the constant term to the right:

Add '0.8333333333' to each side of the equation.
-0.8333333333 + 4x + 0.8333333333 + x2 = 0 + 0.8333333333

Reorder the terms:
-0.8333333333 + 0.8333333333 + 4x + x2 = 0 + 0.8333333333

Combine like terms: -0.8333333333 + 0.8333333333 = 0.0000000000
0.0000000000 + 4x + x2 = 0 + 0.8333333333
4x + x2 = 0 + 0.8333333333

Combine like terms: 0 + 0.8333333333 = 0.8333333333
4x + x2 = 0.8333333333

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 0.8333333333 + 4

Reorder the terms:
4 + 4x + x2 = 0.8333333333 + 4

Combine like terms: 0.8333333333 + 4 = 4.8333333333
4 + 4x + x2 = 4.8333333333

Factor a perfect square on the left side:
(x + 2)(x + 2) = 4.8333333333

Calculate the square root of the right side: 2.198484326

Break this problem into two subproblems by setting 
(x + 2) equal to 2.198484326 and -2.198484326.

Subproblem 1

x + 2 = 2.198484326 Simplifying x + 2 = 2.198484326 Reorder the terms: 2 + x = 2.198484326 Solving 2 + x = 2.198484326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.198484326 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.198484326 + -2 x = 2.198484326 + -2 Combine like terms: 2.198484326 + -2 = 0.198484326 x = 0.198484326 Simplifying x = 0.198484326

Subproblem 2

x + 2 = -2.198484326 Simplifying x + 2 = -2.198484326 Reorder the terms: 2 + x = -2.198484326 Solving 2 + x = -2.198484326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.198484326 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.198484326 + -2 x = -2.198484326 + -2 Combine like terms: -2.198484326 + -2 = -4.198484326 x = -4.198484326 Simplifying x = -4.198484326

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.198484326, -4.198484326}

See similar equations:

| -56=-7(2+2z) | | 18-2x=63+x | | (x+15).33=2x-1 | | 0.4+x=0.25 | | 4x+1=7+2x | | 5-2x=4x+8-6x-3 | | 3x+54+2x+18=18x-54 | | -3h+(-24)=-12 | | 4(y+6)=52 | | X-16-9x=88 | | -4n-(-24)=12 | | 2(6cm+xcm)=(6cm)(x) | | w+4-2w=7 | | 3(w-3)+3=3 | | (-4)x=4 | | 2x-6=6x+5 | | 7+3t=6-t | | 8d+d+5d+3-6d=0 | | 3z-15=2z+13 | | x-6=5-10x | | -4x-2+3x=4 | | -13+7x=13+5x | | 10x+31=4x+7 | | 10=5p+11-4p | | 9x+162+6x+54=54x-162 | | x+(x+2)+x+4=204 | | 2.7+z+4.3=15.4 | | 75=3(-10+-3)+6t | | 88.5x+35=256.25 | | -5.9(4x+6)-1.4(2x-4)= | | -12h+5g+8-g= | | 3(x+18)+2(x+9)=x-54 |

Equations solver categories