-3.6x^2+9x+4=0

Simple and best practice solution for -3.6x^2+9x+4=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 -3.6x^2+9x+4=0 equation:


Simplifying
-3.6x2 + 9x + 4 = 0

Reorder the terms:
4 + 9x + -3.6x2 = 0

Solving
4 + 9x + -3.6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-3.6 the coefficient of the squared term: 

Divide each side by '-3.6'.
-1.111111111 + -2.5x + x2 = 0

Move the constant term to the right:

Add '1.111111111' to each side of the equation.
-1.111111111 + -2.5x + 1.111111111 + x2 = 0 + 1.111111111

Reorder the terms:
-1.111111111 + 1.111111111 + -2.5x + x2 = 0 + 1.111111111

Combine like terms: -1.111111111 + 1.111111111 = 0.000000000
0.000000000 + -2.5x + x2 = 0 + 1.111111111
-2.5x + x2 = 0 + 1.111111111

Combine like terms: 0 + 1.111111111 = 1.111111111
-2.5x + x2 = 1.111111111

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 1.111111111 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 1.111111111 + 1.5625

Combine like terms: 1.111111111 + 1.5625 = 2.673611111
1.5625 + -2.5x + x2 = 2.673611111

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 2.673611111

Calculate the square root of the right side: 1.635118072

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.635118072 and -1.635118072.

Subproblem 1

x + -1.25 = 1.635118072 Simplifying x + -1.25 = 1.635118072 Reorder the terms: -1.25 + x = 1.635118072 Solving -1.25 + x = 1.635118072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.635118072 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.635118072 + 1.25 x = 1.635118072 + 1.25 Combine like terms: 1.635118072 + 1.25 = 2.885118072 x = 2.885118072 Simplifying x = 2.885118072

Subproblem 2

x + -1.25 = -1.635118072 Simplifying x + -1.25 = -1.635118072 Reorder the terms: -1.25 + x = -1.635118072 Solving -1.25 + x = -1.635118072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.635118072 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.635118072 + 1.25 x = -1.635118072 + 1.25 Combine like terms: -1.635118072 + 1.25 = -0.385118072 x = -0.385118072 Simplifying x = -0.385118072

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.885118072, -0.385118072}

See similar equations:

| 6x(x-5)(3x+7)=0 | | -4/5+6/5 | | 6x(x-5)(x+5)=0 | | 10(x-3)=8x-12 | | p^2-19p+34=0 | | -8-9=5x+6-4x | | 6x+10-5x=13 | | x/13=-36+20 | | -6(v+3)+4v+5=7v+12 | | 1/2(3x-21)=5x | | -0.63/-0.7 | | X^4+9x^3+23x^2+3x-36=0 | | 3-12=z/-5 | | 40.06=(x-2.5)+(y)/2 | | 6(x+4)=3(2x-1) | | 1/3(4x-55)=5x | | 4z=17-49 | | 4x^2+40x+18=0 | | 10.25/-0.5 | | 11x+5=4x+40 | | (2x^5)(-4x^9)(2x^6)= | | 3x+7(x-2)=46 | | 7x+2(x-4)=37 | | 6[1-(-4x-2)]=72x+42 | | -17+3=m-10 | | 2(2z)=-16 | | 8p-3q=90 | | a=bxt+cforx | | a=bxt | | X^2-49x+588=0 | | log(x)+log(x^2-4)-log(6)-log(x+2)= | | -11x-20=-10+45 |

Equations solver categories