y^2-8y-12=0

Simple and best practice solution for y^2-8y-12=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^2-8y-12=0 equation:


Simplifying
y2 + -8y + -12 = 0

Reorder the terms:
-12 + -8y + y2 = 0

Solving
-12 + -8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -8y + 12 + y2 = 0 + 12

Reorder the terms:
-12 + 12 + -8y + y2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8y + y2 = 0 + 12
-8y + y2 = 0 + 12

Combine like terms: 0 + 12 = 12
-8y + y2 = 12

The y term is -8y.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8y + 16 + y2 = 12 + 16

Reorder the terms:
16 + -8y + y2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + -8y + y2 = 28

Factor a perfect square on the left side:
(y + -4)(y + -4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(y + -4) equal to 5.291502622 and -5.291502622.

Subproblem 1

y + -4 = 5.291502622 Simplifying y + -4 = 5.291502622 Reorder the terms: -4 + y = 5.291502622 Solving -4 + y = 5.291502622 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = 5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + y = 5.291502622 + 4 y = 5.291502622 + 4 Combine like terms: 5.291502622 + 4 = 9.291502622 y = 9.291502622 Simplifying y = 9.291502622

Subproblem 2

y + -4 = -5.291502622 Simplifying y + -4 = -5.291502622 Reorder the terms: -4 + y = -5.291502622 Solving -4 + y = -5.291502622 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = -5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + y = -5.291502622 + 4 y = -5.291502622 + 4 Combine like terms: -5.291502622 + 4 = -1.291502622 y = -1.291502622 Simplifying y = -1.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.291502622, -1.291502622}

See similar equations:

| x^2-4x+4=.333 | | 3x+30=13-80 | | 25=3x-5 | | 8n-5=8n-7 | | -2p+11=-2p+11 | | -2w+11=39 | | 3m-5=-32 | | 5(k+2)=35 | | (x+9)(x-2)=0 | | 500000=25000+.05x | | 6y-11-5y=25 | | 0.5(8x+6)=0.1-(x-3) | | 5x/2-3=2x-7/7 | | ((4y-5)/2)-((2y-1)/6)=y | | y=6x+22 | | 4(-2x+7)=12 | | x*3=-11 | | 88000=2220x^2+5871x+5072 | | 2y-1.2=5 | | 15y+30=12y+15 | | -0.2x^2+0.1x=-0.03 | | 4y-7=14y+73 | | 3x/5+12=5x/6+5 | | 42(x-1)-35x=42 | | 4(3x)+3x=57 | | 4x-1=2x+23 | | 2x(x+6)=(x-3)(x+6) | | (4y-5)/2-(2y-1)/6=y | | 9x-3=7x-35 | | 2(p-(3p+13)+10)=2(p+3) | | 5x+3=3x+51 | | 3x+6=x+22 |

Equations solver categories