y^2-9y+9=0

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


Simplifying
y2 + -9y + 9 = 0

Reorder the terms:
9 + -9y + y2 = 0

Solving
9 + -9y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -9y + -9 + y2 = 0 + -9

Reorder the terms:
9 + -9 + -9y + y2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -9y + y2 = 0 + -9
-9y + y2 = 0 + -9

Combine like terms: 0 + -9 = -9
-9y + y2 = -9

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = -9 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -9 + 20.25

Combine like terms: -9 + 20.25 = 11.25
20.25 + -9y + y2 = 11.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(y + -4.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

y + -4.5 = 3.354101966 Simplifying y + -4.5 = 3.354101966 Reorder the terms: -4.5 + y = 3.354101966 Solving -4.5 + y = 3.354101966 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 3.354101966 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 3.354101966 + 4.5 y = 3.354101966 + 4.5 Combine like terms: 3.354101966 + 4.5 = 7.854101966 y = 7.854101966 Simplifying y = 7.854101966

Subproblem 2

y + -4.5 = -3.354101966 Simplifying y + -4.5 = -3.354101966 Reorder the terms: -4.5 + y = -3.354101966 Solving -4.5 + y = -3.354101966 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -3.354101966 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -3.354101966 + 4.5 y = -3.354101966 + 4.5 Combine like terms: -3.354101966 + 4.5 = 1.145898034 y = 1.145898034 Simplifying y = 1.145898034

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.854101966, 1.145898034}

See similar equations:

| m=12p-3 | | 3(w-57)+6=93 | | 15x+9=-1 | | .25x=2x | | 26-8y=30 | | (100-(x-425)/9) | | -2(p+82)=34 | | 4x-6=.5x-6 | | 26-8y=-30 | | (160+x)/3 | | .2m+7.7+9.5m=5.3+9.7m+2.4 | | 43=67-u | | 3/2(k+2/5)=21/3 | | -2x+2=16 | | 3x^2-39x+108=0 | | 200.5-20.5s=36.5 | | 200.5-20.5s=36.8 | | 2(n+2)+n-4=9 | | -x+14=19 | | 68=7(p+12)-23 | | 200.5-20.5s=77.5 | | 7.8=5x+15 | | 2b+14h=122 | | Mx^2-2mx+m^2-1=0 | | 69-b=-28 | | X^4+16x^3+60x^2-320x-1250=0 | | 2x-7=4x-17 | | 6x-48=7 | | c+146=179 | | 1x+-3=-9 | | 36=10a-12-17a | | 3p+14=-5p |

Equations solver categories