x=9-x^2

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


Simplifying
x = 9 + -1x2

Solving
x = 9 + -1x2

Solving for variable 'x'.

Reorder the terms:
-9 + x + x2 = 9 + -1x2 + -9 + x2

Reorder the terms:
-9 + x + x2 = 9 + -9 + -1x2 + x2

Combine like terms: 9 + -9 = 0
-9 + x + x2 = 0 + -1x2 + x2
-9 + x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-9 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + x + 9 + x2 = 0 + 9

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

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

Combine like terms: 0 + 9 = 9
x + x2 = 9

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 9 + 0.25

Reorder the terms:
0.25 + x + x2 = 9 + 0.25

Combine like terms: 9 + 0.25 = 9.25
0.25 + x + x2 = 9.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

x + 0.5 = 3.041381265 Simplifying x + 0.5 = 3.041381265 Reorder the terms: 0.5 + x = 3.041381265 Solving 0.5 + x = 3.041381265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.041381265 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.041381265 + -0.5 x = 3.041381265 + -0.5 Combine like terms: 3.041381265 + -0.5 = 2.541381265 x = 2.541381265 Simplifying x = 2.541381265

Subproblem 2

x + 0.5 = -3.041381265 Simplifying x + 0.5 = -3.041381265 Reorder the terms: 0.5 + x = -3.041381265 Solving 0.5 + x = -3.041381265 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.041381265 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.041381265 + -0.5 x = -3.041381265 + -0.5 Combine like terms: -3.041381265 + -0.5 = -3.541381265 x = -3.541381265 Simplifying x = -3.541381265

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.541381265, -3.541381265}

See similar equations:

| 22m=3.14r^2 | | 200y=50x | | -7+15d+9d+7y= | | 0.2(20)+0.6x=0.5(20+x) | | o-8=16+12 | | Ac=2x-1 | | 300=l-75 | | 2d(3*6)=48*1/4 | | 4(z)=20 | | -6=4/y | | 1/2m=176-9m/14 | | 2-4x=-24x+12 | | x/a=y/x | | 4xz=20 | | 300=1-75 | | -486/(-2) | | -5(4y-8)+4(2y+9)= | | -7c+15d+9xy+7y= | | 2(1+x)+2(x+1)=24 | | X+90=15 | | 3t+2t-1= | | 30+64/(-42)*6= | | 28+i=47 | | x+7=1Q | | X+90=42 | | H-15=17 | | 35x^3-12= | | 64+x=90 | | 5Y-7x=8 | | -3-2.5x=-18 | | 53.60+(.53x)=55.93+(-1.08x) | | 7+9+h=80 |

Equations solver categories