3X^2-9X=4

Simple and best practice solution for 3X^2-9X=4 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^2-9X=4 equation:


Simplifying
3X2 + -9X = 4

Reorder the terms:
-9X + 3X2 = 4

Solving
-9X + 3X2 = 4

Solving for variable 'X'.

Reorder the terms:
-4 + -9X + 3X2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -9X + 3X2 = 0

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

Divide each side by '3'.
-1.333333333 + -3X + X2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + -3X + 1.333333333 + X2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + -3X + X2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + -3X + X2 = 0 + 1.333333333
-3X + X2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
-3X + X2 = 1.333333333

The X term is -3X.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3X + 2.25 + X2 = 1.333333333 + 2.25

Reorder the terms:
2.25 + -3X + X2 = 1.333333333 + 2.25

Combine like terms: 1.333333333 + 2.25 = 3.583333333
2.25 + -3X + X2 = 3.583333333

Factor a perfect square on the left side:
(X + -1.5)(X + -1.5) = 3.583333333

Calculate the square root of the right side: 1.892969449

Break this problem into two subproblems by setting 
(X + -1.5) equal to 1.892969449 and -1.892969449.

Subproblem 1

X + -1.5 = 1.892969449 Simplifying X + -1.5 = 1.892969449 Reorder the terms: -1.5 + X = 1.892969449 Solving -1.5 + X = 1.892969449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = 1.892969449 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = 1.892969449 + 1.5 X = 1.892969449 + 1.5 Combine like terms: 1.892969449 + 1.5 = 3.392969449 X = 3.392969449 Simplifying X = 3.392969449

Subproblem 2

X + -1.5 = -1.892969449 Simplifying X + -1.5 = -1.892969449 Reorder the terms: -1.5 + X = -1.892969449 Solving -1.5 + X = -1.892969449 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + X = -1.892969449 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + X = -1.892969449 + 1.5 X = -1.892969449 + 1.5 Combine like terms: -1.892969449 + 1.5 = -0.392969449 X = -0.392969449 Simplifying X = -0.392969449

Solution

The solution to the problem is based on the solutions from the subproblems. X = {3.392969449, -0.392969449}

See similar equations:

| 12x=-2x+14 | | 2n+1=51 | | 12l+18=20l+10 | | 25+3x=25 | | 5x-2(2x)=6x | | y/-312 | | 4m-2m=32-12 | | 4m-2m=32+13 | | 3y-(-180+7y)+4y=180 | | x-(x-11604)*.1-x*.199=10000 | | 3(2x+6)=2(2x+10) | | 4-7(2n+1)=2(3-5n) | | 7a+6b=150 | | -p(d+z)=-2+59 | | 2x+5x+10x=20 | | -9=-2-k | | -p(d+z)=-22+59 | | -7(x-2)-2=12 | | -5=3+4x | | 8n+5=23-2n | | x^2+6xb+8b^2=0 | | 13=8a+7-11a | | x^2+6bx+8b^2=0 | | 4m+34m=12 | | 3.9*.06=x | | 4+8x=-5 | | X/2=35 | | 3.9*.06= | | 10u^2y-25u^5/15u^5x | | y-7=3(x-5) | | x-x^3=A*(x-x^2) | | 6x+15=8x-3 |

Equations solver categories