4*x^2=8-9*x

Simple and best practice solution for 4*x^2=8-9*x 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 4*x^2=8-9*x equation:


Simplifying
4x2 = 8 + -9x

Solving
4x2 = 8 + -9x

Solving for variable 'x'.

Reorder the terms:
-8 + 9x + 4x2 = 8 + -9x + -8 + 9x

Reorder the terms:
-8 + 9x + 4x2 = 8 + -8 + -9x + 9x

Combine like terms: 8 + -8 = 0
-8 + 9x + 4x2 = 0 + -9x + 9x
-8 + 9x + 4x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
-8 + 9x + 4x2 = 0

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

Divide each side by '4'.
-2 + 2.25x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2.25x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 2.25x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2.25x + x2 = 0 + 2
2.25x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
2.25x + x2 = 2

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = 2 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 2 + 1.265625

Combine like terms: 2 + 1.265625 = 3.265625
1.265625 + 2.25x + x2 = 3.265625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 3.265625

Calculate the square root of the right side: 1.807104037

Break this problem into two subproblems by setting 
(x + 1.125) equal to 1.807104037 and -1.807104037.

Subproblem 1

x + 1.125 = 1.807104037 Simplifying x + 1.125 = 1.807104037 Reorder the terms: 1.125 + x = 1.807104037 Solving 1.125 + x = 1.807104037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 1.807104037 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 1.807104037 + -1.125 x = 1.807104037 + -1.125 Combine like terms: 1.807104037 + -1.125 = 0.682104037 x = 0.682104037 Simplifying x = 0.682104037

Subproblem 2

x + 1.125 = -1.807104037 Simplifying x + 1.125 = -1.807104037 Reorder the terms: 1.125 + x = -1.807104037 Solving 1.125 + x = -1.807104037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -1.807104037 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -1.807104037 + -1.125 x = -1.807104037 + -1.125 Combine like terms: -1.807104037 + -1.125 = -2.932104037 x = -2.932104037 Simplifying x = -2.932104037

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.682104037, -2.932104037}

See similar equations:

| 14d+-9d=-15 | | 3+2r-2=9r+3-5r | | x^2-6*x+5=0 | | 6x+9=-3-27 | | 15m-5m-m-6m=18 | | 1.5/3.5=m/7 | | 3x+y-x+y=0 | | -4x+9=5x-63 | | (6-7i)/(2i) | | x2/4=9 | | -6(1-5v)-4=50 | | 15k-5k-k=18 | | -7x+5(-x+5)=121 | | 4+7x=19-2x | | 10c+4c-9c-4c+2c=12 | | 12c-9c-3c+c=13 | | -131+(-12)= | | 3/10x=7/18 | | -y=-3x-2 | | 2(4x+8)=3x-12 | | 5y+6y-81=7y+10z+65y | | 6x-13=4x-18 | | 21/40-3/8 | | (9x-5)=4x+29 | | 9(t-3)+3t=4(3t+4)-9 | | 5x+4(-6x-11)=89 | | 18.24+m=32.24 | | 8xc=912 | | (3x-4x+2y)(2y+3y+2x)= | | x=(165/14) | | 875=5(x+19) | | 12/39=-4/13 |

Equations solver categories