2y^2-1=5y

Simple and best practice solution for 2y^2-1=5y 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 2y^2-1=5y equation:


Simplifying
2y2 + -1 = 5y

Reorder the terms:
-1 + 2y2 = 5y

Solving
-1 + 2y2 = 5y

Solving for variable 'y'.

Reorder the terms:
-1 + -5y + 2y2 = 5y + -5y

Combine like terms: 5y + -5y = 0
-1 + -5y + 2y2 = 0

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

Divide each side by '2'.
-0.5 + -2.5y + y2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -2.5y + 0.5 + y2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -2.5y + y2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -2.5y + y2 = 0 + 0.5
-2.5y + y2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-2.5y + y2 = 0.5

The y term is -2.5y.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5y + 1.5625 + y2 = 0.5 + 1.5625

Reorder the terms:
1.5625 + -2.5y + y2 = 0.5 + 1.5625

Combine like terms: 0.5 + 1.5625 = 2.0625
1.5625 + -2.5y + y2 = 2.0625

Factor a perfect square on the left side:
(y + -1.25)(y + -1.25) = 2.0625

Calculate the square root of the right side: 1.436140662

Break this problem into two subproblems by setting 
(y + -1.25) equal to 1.436140662 and -1.436140662.

Subproblem 1

y + -1.25 = 1.436140662 Simplifying y + -1.25 = 1.436140662 Reorder the terms: -1.25 + y = 1.436140662 Solving -1.25 + y = 1.436140662 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = 1.436140662 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = 1.436140662 + 1.25 y = 1.436140662 + 1.25 Combine like terms: 1.436140662 + 1.25 = 2.686140662 y = 2.686140662 Simplifying y = 2.686140662

Subproblem 2

y + -1.25 = -1.436140662 Simplifying y + -1.25 = -1.436140662 Reorder the terms: -1.25 + y = -1.436140662 Solving -1.25 + y = -1.436140662 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = -1.436140662 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = -1.436140662 + 1.25 y = -1.436140662 + 1.25 Combine like terms: -1.436140662 + 1.25 = -0.186140662 y = -0.186140662 Simplifying y = -0.186140662

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.686140662, -0.186140662}

See similar equations:

| -4x^3+20x^2+12x= | | 0.50(x-4)=x-4 | | 7.92n+2.38=3.22n+4.92 | | -5+.75k=-1+.25k | | -2x-6=2(x+7) | | 7(4x+15)=6(8x+4) | | 5(n+2)=2n+1 | | -24+x=3(-7) | | 7m-15-24m+78=126 | | 4+2p=8p+16 | | 10p+12=17 | | 4x+3=x+84 | | x-3y=7x-2y+2 | | -20x-3=-9x-80 | | -7n^2=-7 | | 14=n-8 | | 3(x-45)=540 | | 6x-12-16=6x-15+11 | | -3.5r+8.5-7r=-18.5 | | -4y+10=-2(3y)+1 | | 3(x)+4=-8 | | 3y-14=52 | | 4y+10y= | | 2=7-3a | | 3.7x=2.7x+7 | | 4x+14=-6 | | 9+4*n=2n-1 | | (r+4)4=8 | | 4(w+9)=8w+40 | | -5(t-8)-(t+8)=5 | | 4x+26x-8=6(5x+1) | | X=24-2y |

Equations solver categories