3y^2+y-2=7

Simple and best practice solution for 3y^2+y-2=7 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 3y^2+y-2=7 equation:


Simplifying
3y2 + y + -2 = 7

Reorder the terms:
-2 + y + 3y2 = 7

Solving
-2 + y + 3y2 = 7

Solving for variable 'y'.

Reorder the terms:
-2 + -7 + y + 3y2 = 7 + -7

Combine like terms: -2 + -7 = -9
-9 + y + 3y2 = 7 + -7

Combine like terms: 7 + -7 = 0
-9 + y + 3y2 = 0

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

Divide each side by '3'.
-3 + 0.3333333333y + y2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 0.3333333333y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + 0.3333333333y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 0.3333333333y + y2 = 0 + 3
0.3333333333y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
0.3333333333y + y2 = 3

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.3333333333y + 0.25 + y2 = 3 + 0.25

Reorder the terms:
0.25 + 0.3333333333y + y2 = 3 + 0.25

Combine like terms: 3 + 0.25 = 3.25
0.25 + 0.3333333333y + y2 = 3.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(y + 0.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

y + 0.5 = 1.802775638 Simplifying y + 0.5 = 1.802775638 Reorder the terms: 0.5 + y = 1.802775638 Solving 0.5 + y = 1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 1.802775638 + -0.5 y = 1.802775638 + -0.5 Combine like terms: 1.802775638 + -0.5 = 1.302775638 y = 1.302775638 Simplifying y = 1.302775638

Subproblem 2

y + 0.5 = -1.802775638 Simplifying y + 0.5 = -1.802775638 Reorder the terms: 0.5 + y = -1.802775638 Solving 0.5 + y = -1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -1.802775638 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -1.802775638 + -0.5 y = -1.802775638 + -0.5 Combine like terms: -1.802775638 + -0.5 = -2.302775638 y = -2.302775638 Simplifying y = -2.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.302775638, -2.302775638}

See similar equations:

| 15x+20=-17x-32 | | 4x-16=10x+7 | | 3y^2+-2=7 | | ln(x+7)=6 | | 27-6x=16+5x | | F(3.5)-1.5= | | (1/3)x-15=(1/8) | | y=-5/6 | | y+4=1(x+9) | | (x+4)(5x+7)=0 | | f(x)=-x^2-10x-24 | | y-4=1(x-9) | | x+151=180 | | x^2+10x+26=y | | 6x+54=10x-10 | | 2q-5=-3(q-8)+4q | | (3c^2-4cd+8d^2)(c-2d)=0 | | (x)squared/0.12 | | 4/5b=6/9 | | 12x^2-48x=36 | | 21+2y=9y | | 8x^2=63 | | 200x0.08/20 | | 9v=16+v | | (3x+5y)(7x-4y)=0 | | x+67=90 | | .125x=.125x+.025 | | 20-(2x6)=8/4= | | 2/3q-2=1/3q | | 3y+x+5=0 | | 6y+mx=c | | 1/2x(2x-6)=-6 |

Equations solver categories