3x^2-9x+2=0

Simple and best practice solution for 3x^2-9x+2=0 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+2=0 equation:


Simplifying
3x2 + -9x + 2 = 0

Reorder the terms:
2 + -9x + 3x2 = 0

Solving
2 + -9x + 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'.
0.6666666667 + -3x + x2 = 0

Move the constant term to the right:

Add '-0.6666666667' to each side of the equation.
0.6666666667 + -3x + -0.6666666667 + x2 = 0 + -0.6666666667

Reorder the terms:
0.6666666667 + -0.6666666667 + -3x + x2 = 0 + -0.6666666667

Combine like terms: 0.6666666667 + -0.6666666667 = 0.0000000000
0.0000000000 + -3x + x2 = 0 + -0.6666666667
-3x + x2 = 0 + -0.6666666667

Combine like terms: 0 + -0.6666666667 = -0.6666666667
-3x + x2 = -0.6666666667

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 = -0.6666666667 + 2.25

Reorder the terms:
2.25 + -3x + x2 = -0.6666666667 + 2.25

Combine like terms: -0.6666666667 + 2.25 = 1.5833333333
2.25 + -3x + x2 = 1.5833333333

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 1.5833333333

Calculate the square root of the right side: 1.258305739

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.258305739 and -1.258305739.

Subproblem 1

x + -1.5 = 1.258305739 Simplifying x + -1.5 = 1.258305739 Reorder the terms: -1.5 + x = 1.258305739 Solving -1.5 + x = 1.258305739 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 = 1.258305739 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.258305739 + 1.5 x = 1.258305739 + 1.5 Combine like terms: 1.258305739 + 1.5 = 2.758305739 x = 2.758305739 Simplifying x = 2.758305739

Subproblem 2

x + -1.5 = -1.258305739 Simplifying x + -1.5 = -1.258305739 Reorder the terms: -1.5 + x = -1.258305739 Solving -1.5 + x = -1.258305739 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 = -1.258305739 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.258305739 + 1.5 x = -1.258305739 + 1.5 Combine like terms: -1.258305739 + 1.5 = 0.241694261 x = 0.241694261 Simplifying x = 0.241694261

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.758305739, 0.241694261}

See similar equations:

| 16a-25b= | | 0=20-2p | | 5y+8=73 | | 77=3w+17 | | -16=-4x | | -5y=-20 | | 9.6c=3c+84 | | -16=-4w | | 8x+14=0 | | x(2x+1)=6(x+2) | | X+y=32 | | 5(2x-9)-3=5(x-4)-13 | | 2(x+1)=7(x-2)-6 | | 6x-2=4x+40 | | 5x-2=2x-50 | | r^2=15-2r | | 8x+6=6x+40 | | 4y^3+2y^2-4y+1=0 | | 5x-(2x+3)=9 | | 11x^2-6x=0 | | -5u+2(u+3)=9 | | 8(6x-5)=47 | | x(x+7)=3(x+4) | | 5(u+7)=-2u+21 | | 4x-18=-82 | | -7Y+5(y-8)=-32 | | 37=-5Y+2(y+5) | | 2y+16=40 | | 3U+24=-3(u+4) | | -28=6(v-7)-8V | | (x-1)(4x+1)=0 | | 76-2x=7x-22 |

Equations solver categories