y=y^2-9y+8

Simple and best practice solution for y=y^2-9y+8 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=y^2-9y+8 equation:


Simplifying
y = y2 + -9y + 8

Reorder the terms:
y = 8 + -9y + y2

Solving
y = 8 + -9y + y2

Solving for variable 'y'.

Reorder the terms:
-8 + y + 9y + -1y2 = 8 + -9y + y2 + -8 + 9y + -1y2

Combine like terms: y + 9y = 10y
-8 + 10y + -1y2 = 8 + -9y + y2 + -8 + 9y + -1y2

Reorder the terms:
-8 + 10y + -1y2 = 8 + -8 + -9y + 9y + y2 + -1y2

Combine like terms: 8 + -8 = 0
-8 + 10y + -1y2 = 0 + -9y + 9y + y2 + -1y2
-8 + 10y + -1y2 = -9y + 9y + y2 + -1y2

Combine like terms: -9y + 9y = 0
-8 + 10y + -1y2 = 0 + y2 + -1y2
-8 + 10y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-8 + 10y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
8 + -10y + y2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -10y + -8 + y2 = 0 + -8

Reorder the terms:
8 + -8 + -10y + y2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -10y + y2 = 0 + -8
-10y + y2 = 0 + -8

Combine like terms: 0 + -8 = -8
-10y + y2 = -8

The y term is -10y.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10y + 25 + y2 = -8 + 25

Reorder the terms:
25 + -10y + y2 = -8 + 25

Combine like terms: -8 + 25 = 17
25 + -10y + y2 = 17

Factor a perfect square on the left side:
(y + -5)(y + -5) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(y + -5) equal to 4.123105626 and -4.123105626.

Subproblem 1

y + -5 = 4.123105626 Simplifying y + -5 = 4.123105626 Reorder the terms: -5 + y = 4.123105626 Solving -5 + y = 4.123105626 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 4.123105626 + 5 Combine like terms: -5 + 5 = 0 0 + y = 4.123105626 + 5 y = 4.123105626 + 5 Combine like terms: 4.123105626 + 5 = 9.123105626 y = 9.123105626 Simplifying y = 9.123105626

Subproblem 2

y + -5 = -4.123105626 Simplifying y + -5 = -4.123105626 Reorder the terms: -5 + y = -4.123105626 Solving -5 + y = -4.123105626 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -4.123105626 + 5 Combine like terms: -5 + 5 = 0 0 + y = -4.123105626 + 5 y = -4.123105626 + 5 Combine like terms: -4.123105626 + 5 = 0.876894374 y = 0.876894374 Simplifying y = 0.876894374

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.123105626, 0.876894374}

See similar equations:

| a/a-8=-6/a-4 | | -4x-4x+22=30 | | N+7=23 | | -3(2)-3z-1=24 | | 9/10-3/7 | | 29/-17 | | 1-(1/x2) | | 4p=3p-3 | | -3[2x-3]=-5x+5 | | (4x^2/15)*(5/8x^5) | | 18x^3+27x^2= | | 4x-1-5-3x-7=0 | | 5[7-(8x-3)]+8x=0 | | 5(1)-6(-4)=-17 | | 2(x-2)6=5x-3(2+x) | | (y-9)-y-6=4y | | x^2(9-x)=0 | | (y-9)-9-6=4y | | 6g^2+64g-22=0 | | 6w=2316 | | 8y+5x=8 | | 3-x+7=-x | | 12k-[4k+(-2+3k)]= | | 14+k=29 | | 4x-2=4x+7 | | (x^2)+16x-36=0 | | 4x+3a=3x-2aforx | | -1.92=sin(.49X-1.86) | | 5x-3-4x=10 | | -17+n=-20 | | -55m=m^2 | | Tanx=(-1^(13/10)) |

Equations solver categories