y^2-19y-18=0

Simple and best practice solution for y^2-19y-18=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^2-19y-18=0 equation:


Simplifying
y2 + -19y + -18 = 0

Reorder the terms:
-18 + -19y + y2 = 0

Solving
-18 + -19y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -19y + 18 + y2 = 0 + 18

Reorder the terms:
-18 + 18 + -19y + y2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -19y + y2 = 0 + 18
-19y + y2 = 0 + 18

Combine like terms: 0 + 18 = 18
-19y + y2 = 18

The y term is -19y.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19y + 90.25 + y2 = 18 + 90.25

Reorder the terms:
90.25 + -19y + y2 = 18 + 90.25

Combine like terms: 18 + 90.25 = 108.25
90.25 + -19y + y2 = 108.25

Factor a perfect square on the left side:
(y + -9.5)(y + -9.5) = 108.25

Calculate the square root of the right side: 10.404326023

Break this problem into two subproblems by setting 
(y + -9.5) equal to 10.404326023 and -10.404326023.

Subproblem 1

y + -9.5 = 10.404326023 Simplifying y + -9.5 = 10.404326023 Reorder the terms: -9.5 + y = 10.404326023 Solving -9.5 + y = 10.404326023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + y = 10.404326023 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + y = 10.404326023 + 9.5 y = 10.404326023 + 9.5 Combine like terms: 10.404326023 + 9.5 = 19.904326023 y = 19.904326023 Simplifying y = 19.904326023

Subproblem 2

y + -9.5 = -10.404326023 Simplifying y + -9.5 = -10.404326023 Reorder the terms: -9.5 + y = -10.404326023 Solving -9.5 + y = -10.404326023 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + y = -10.404326023 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + y = -10.404326023 + 9.5 y = -10.404326023 + 9.5 Combine like terms: -10.404326023 + 9.5 = -0.904326023 y = -0.904326023 Simplifying y = -0.904326023

Solution

The solution to the problem is based on the solutions from the subproblems. y = {19.904326023, -0.904326023}

See similar equations:

| 4/k*2-8k+12=k/k-2+1/k-6 | | 3x+5x=6(5)+2 | | 4=5+a/5 | | d^2-38d=0 | | 10+x+60=180 | | x-102=-8x+105 | | 6x^2=360 | | g^2+34g=0 | | 120-x+60+10+x=180 | | x(9x+19)=4x^2-10x+42 | | 5x^2-2=88 | | 5.25X+6.00(4X)=789.75 | | x^2+25+3x=(x+3)(2x-1) | | .7(5x+10)=1.8-(x+2) | | 77=-7-6a | | 5f^2-23f-10=0 | | 20x-48+52=180 | | 4xn-3=6n-8 | | 5(p+3)=46 | | x*1.6=.8 | | y^2=9/16 | | 10y^2-y-3=0 | | 3x/4+7x/2=18 | | -8b^2=-192 | | 1=m/5+3 | | 6x+14+40=180 | | 8x^2-2a=3 | | (10X+7)=18 | | 35+2.5y-.5y=3 | | 5x+13=3x+29 | | n+(n+1)=171 | | 4(2y-1)=2(y+2) |

Equations solver categories