y^2+9y=18

Simple and best practice solution for y^2+9y=18 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=18 equation:


Simplifying
y2 + 9y = 18

Reorder the terms:
9y + y2 = 18

Solving
9y + y2 = 18

Solving for variable 'y'.

Reorder the terms:
-18 + 9y + y2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 9y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 9y + 18 + y2 = 0 + 18

Reorder the terms:
-18 + 18 + 9y + y2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 9y + y2 = 0 + 18
9y + y2 = 0 + 18

Combine like terms: 0 + 18 = 18
9y + y2 = 18

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 = 18 + 20.25

Reorder the terms:
20.25 + 9y + y2 = 18 + 20.25

Combine like terms: 18 + 20.25 = 38.25
20.25 + 9y + y2 = 38.25

Factor a perfect square on the left side:
(y + 4.5)(y + 4.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(y + 4.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

y + 4.5 = 6.184658438 Simplifying y + 4.5 = 6.184658438 Reorder the terms: 4.5 + y = 6.184658438 Solving 4.5 + y = 6.184658438 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 = 6.184658438 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + y = 6.184658438 + -4.5 y = 6.184658438 + -4.5 Combine like terms: 6.184658438 + -4.5 = 1.684658438 y = 1.684658438 Simplifying y = 1.684658438

Subproblem 2

y + 4.5 = -6.184658438 Simplifying y + 4.5 = -6.184658438 Reorder the terms: 4.5 + y = -6.184658438 Solving 4.5 + y = -6.184658438 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 = -6.184658438 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + y = -6.184658438 + -4.5 y = -6.184658438 + -4.5 Combine like terms: -6.184658438 + -4.5 = -10.684658438 y = -10.684658438 Simplifying y = -10.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.684658438, -10.684658438}

See similar equations:

| -3b+9=-21 | | 8y+4y+8=15y-9 | | 8-3/8k-4 | | -6m+4m=-4 | | 12+2h=-4 | | 49v^2-27v+14=0 | | 18=28+4f | | 13xwhat=52 | | 10/8=x/:10 | | p/-5=-5 | | (2x^2)-5x+2=(x^2)-2x+6 | | (-x)(-3y)(-z)= | | 39=8(5b+5)+7(8b-7) | | 0.15m+3.36=9.66 | | 2/3×-8=10 | | 5(9x-1)=10(9x+4) | | 153=241-w | | 5g+18-7g+4g=5 | | -3k-5-5=-186 | | c+5=1 | | 8m+2m=10 | | 12t+2=-4 | | 3(a+1)+5a=33 | | -390+p=11-67 | | 900=x+2*x-40+x+60 | | 2x+2-6(x+1)=4x+3 | | -2+8(x-2)=-6(8x-7)-4 | | X+(-8)=24 | | -3-5-5=-186 | | -33+(-7)=p+29 | | 47/9+3/2x=5/3(5/2x+1) | | 12t-2=-4 |

Equations solver categories