3x^2=5-9x

Simple and best practice solution for 3x^2=5-9x 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=5-9x equation:


Simplifying
3x2 = 5 + -9x

Solving
3x2 = 5 + -9x

Solving for variable 'x'.

Reorder the terms:
-5 + 9x + 3x2 = 5 + -9x + -5 + 9x

Reorder the terms:
-5 + 9x + 3x2 = 5 + -5 + -9x + 9x

Combine like terms: 5 + -5 = 0
-5 + 9x + 3x2 = 0 + -9x + 9x
-5 + 9x + 3x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
-5 + 9x + 3x2 = 0

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

Divide each side by '3'.
-1.666666667 + 3x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 3x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 3x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 3x + x2 = 0 + 1.666666667
3x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
3x + x2 = 1.666666667

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 = 1.666666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1.666666667 + 2.25

Combine like terms: 1.666666667 + 2.25 = 3.916666667
2.25 + 3x + x2 = 3.916666667

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 3.916666667

Calculate the square root of the right side: 1.979057015

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.979057015 and -1.979057015.

Subproblem 1

x + 1.5 = 1.979057015 Simplifying x + 1.5 = 1.979057015 Reorder the terms: 1.5 + x = 1.979057015 Solving 1.5 + x = 1.979057015 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 = 1.979057015 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.979057015 + -1.5 x = 1.979057015 + -1.5 Combine like terms: 1.979057015 + -1.5 = 0.479057015 x = 0.479057015 Simplifying x = 0.479057015

Subproblem 2

x + 1.5 = -1.979057015 Simplifying x + 1.5 = -1.979057015 Reorder the terms: 1.5 + x = -1.979057015 Solving 1.5 + x = -1.979057015 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 = -1.979057015 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.979057015 + -1.5 x = -1.979057015 + -1.5 Combine like terms: -1.979057015 + -1.5 = -3.479057015 x = -3.479057015 Simplifying x = -3.479057015

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.479057015, -3.479057015}

See similar equations:

| x^452315+34698x=x(3289567-24x) | | 12x(x+7)=441 | | -6b+1+4b=3b+6 | | 18t-5(3t-9)=0 | | 18t-5(3t-9)= | | 3n^2+16n+13=0 | | 4x^2+40x=-91 | | 25x^2-20x=1 | | 4(x+2)=2x+38 | | A+a+b+b=45 | | 3(x-2)+5=4(x-1) | | -8x^3-2x^2-43x+30=0 | | 2a+2b=45 | | X^2-10X+3=-6-4X | | 2s+2f=45 | | 5x+y=-7 | | 420=2(4w)+2w | | 4x^2-40x=-91 | | 5x(7x-3x)=16x+15 | | lx+2l=5 | | a-43=17 | | x+x+4=118 | | 3xy+xy-4x+x=18 | | u/6=-25 | | 12x+7x=34 | | f-5=-39 | | x^2-12x+27= | | x^2+10x+31= | | y-1=3(x-(-3)) | | y-1=-3(x-(-3)) | | 10*x^2-3*x-1=0 | | p/5=-3 |

Equations solver categories