2n^2-n-2=0

Simple and best practice solution for 2n^2-n-2=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 2n^2-n-2=0 equation:


Simplifying
2n2 + -1n + -2 = 0

Reorder the terms:
-2 + -1n + 2n2 = 0

Solving
-2 + -1n + 2n2 = 0

Solving for variable 'n'.

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

Divide each side by '2'.
-1 + -0.5n + n2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.5n + 1 + n2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.5n + n2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.5n + n2 = 0 + 1
-0.5n + n2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.5n + n2 = 1

The n term is -0.5n.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5n + 0.0625 + n2 = 1 + 0.0625

Reorder the terms:
0.0625 + -0.5n + n2 = 1 + 0.0625

Combine like terms: 1 + 0.0625 = 1.0625
0.0625 + -0.5n + n2 = 1.0625

Factor a perfect square on the left side:
(n + -0.25)(n + -0.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(n + -0.25) equal to 1.030776406 and -1.030776406.

Subproblem 1

n + -0.25 = 1.030776406 Simplifying n + -0.25 = 1.030776406 Reorder the terms: -0.25 + n = 1.030776406 Solving -0.25 + n = 1.030776406 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + n = 1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + n = 1.030776406 + 0.25 n = 1.030776406 + 0.25 Combine like terms: 1.030776406 + 0.25 = 1.280776406 n = 1.280776406 Simplifying n = 1.280776406

Subproblem 2

n + -0.25 = -1.030776406 Simplifying n + -0.25 = -1.030776406 Reorder the terms: -0.25 + n = -1.030776406 Solving -0.25 + n = -1.030776406 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + n = -1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + n = -1.030776406 + 0.25 n = -1.030776406 + 0.25 Combine like terms: -1.030776406 + 0.25 = -0.780776406 n = -0.780776406 Simplifying n = -0.780776406

Solution

The solution to the problem is based on the solutions from the subproblems. n = {1.280776406, -0.780776406}

See similar equations:

| -7x+10-7x=-74 | | 1.08(1.22)(6-x)=7 | | -4k-10=-5k+18 | | tn=-2n+5 | | 2a^2-a-11=0 | | 1.5(1+0.5x)=-6 | | 8y=93.6 | | 2a^2-1-13=2 | | 3x-(2x+1)=3x+(5-4x) | | t+39.5=54.1 | | 1.2=-1.4+10x | | 5(t+2)+9t=6 | | m/8-(12-3)=-12 | | 6a^2-35-11=0 | | r-6.25=17.3 | | p-29.4=3.7 | | h/0.4=7.2 | | 3/4n+5=-7 | | -3.4c=20.74 | | -2(3s-6)-12=-3(5s+1)-5 | | 62-2x=34x+18 | | 4/5h=8/9 | | -y+5=6y+12 | | -1/5(x-2/5)=-1/9(x-6) | | 15-19=6u-8u | | 2(x-1)+3(x+1)=4(x+2) | | 1/4s=3/4 | | 3/4=5/6w | | -3y+10=1 | | 2(x-1)-3(x+1)=4(x+2) | | 9c+4+3=27 | | -3(4s-4)-12=-3(8s+1)-3 |

Equations solver categories