3(x^2-4x)=77

Simple and best practice solution for 3(x^2-4x)=77 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 3(x^2-4x)=77 equation:


Simplifying
3(x2 + -4x) = 77

Reorder the terms:
3(-4x + x2) = 77
(-4x * 3 + x2 * 3) = 77
(-12x + 3x2) = 77

Solving
-12x + 3x2 = 77

Solving for variable 'x'.

Reorder the terms:
-77 + -12x + 3x2 = 77 + -77

Combine like terms: 77 + -77 = 0
-77 + -12x + 3x2 = 0

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

Divide each side by '3'.
-25.66666667 + -4x + x2 = 0

Move the constant term to the right:

Add '25.66666667' to each side of the equation.
-25.66666667 + -4x + 25.66666667 + x2 = 0 + 25.66666667

Reorder the terms:
-25.66666667 + 25.66666667 + -4x + x2 = 0 + 25.66666667

Combine like terms: -25.66666667 + 25.66666667 = 0.00000000
0.00000000 + -4x + x2 = 0 + 25.66666667
-4x + x2 = 0 + 25.66666667

Combine like terms: 0 + 25.66666667 = 25.66666667
-4x + x2 = 25.66666667

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 = 25.66666667 + 4

Reorder the terms:
4 + -4x + x2 = 25.66666667 + 4

Combine like terms: 25.66666667 + 4 = 29.66666667
4 + -4x + x2 = 29.66666667

Factor a perfect square on the left side:
(x + -2)(x + -2) = 29.66666667

Calculate the square root of the right side: 5.446711546

Break this problem into two subproblems by setting 
(x + -2) equal to 5.446711546 and -5.446711546.

Subproblem 1

x + -2 = 5.446711546 Simplifying x + -2 = 5.446711546 Reorder the terms: -2 + x = 5.446711546 Solving -2 + x = 5.446711546 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 = 5.446711546 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.446711546 + 2 x = 5.446711546 + 2 Combine like terms: 5.446711546 + 2 = 7.446711546 x = 7.446711546 Simplifying x = 7.446711546

Subproblem 2

x + -2 = -5.446711546 Simplifying x + -2 = -5.446711546 Reorder the terms: -2 + x = -5.446711546 Solving -2 + x = -5.446711546 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 = -5.446711546 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.446711546 + 2 x = -5.446711546 + 2 Combine like terms: -5.446711546 + 2 = -3.446711546 x = -3.446711546 Simplifying x = -3.446711546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.446711546, -3.446711546}

See similar equations:

| 1+4(-8x-6)=-2(5x+3)+9 | | -11=2(v-3)-7v | | 15-2x-8-6x=-21x+4-10 | | f(x)8x-2+g(x)=5x^2 | | 7-2(2y-4)=6(-2y-1)+5 | | f(x)=-8x-2 | | 9m^2-9m+11=3 | | d=3(62) | | 2x+5(2x+4)=7-6x | | -4x+3=-x | | -20+5d=-2+17d-18 | | 2(4+x)+3x=114 | | 8y-(8-8)-6y-y+14= | | =ln(x^2+3x+5) | | 2(4+x)-3x=114 | | 44-(x+7)=9x-3 | | (x+2)-0.5(x+2)=-0.2x-0.4 | | -0.4(x+3)=-0.9(x+1) | | -10m=8-9m | | 36x=720 | | -2(x-1)=4-x | | 15p^2-21p-18=0 | | 6z+11=-5z | | 3(3)=2(9)-9 | | 34+2x=25+3x | | 62.5-4x= | | x+50=2x+8 | | 2(3)=9-3 | | -13+4x=-39+14 | | d=(2.5)(64) | | 7/10/15=3/5y+6/5 | | 25n^3+35n^2=0 |

Equations solver categories