u^2-6u-8=0

Simple and best practice solution for u^2-6u-8=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 u^2-6u-8=0 equation:


Simplifying
u2 + -6u + -8 = 0

Reorder the terms:
-8 + -6u + u2 = 0

Solving
-8 + -6u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6u + 8 + u2 = 0 + 8

Reorder the terms:
-8 + 8 + -6u + u2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6u + u2 = 0 + 8
-6u + u2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6u + u2 = 8

The u term is -6u.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6u + 9 + u2 = 8 + 9

Reorder the terms:
9 + -6u + u2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6u + u2 = 17

Factor a perfect square on the left side:
(u + -3)(u + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(u + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

u + -3 = 4.123105626 Simplifying u + -3 = 4.123105626 Reorder the terms: -3 + u = 4.123105626 Solving -3 + u = 4.123105626 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + u = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + u = 4.123105626 + 3 u = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 u = 7.123105626 Simplifying u = 7.123105626

Subproblem 2

u + -3 = -4.123105626 Simplifying u + -3 = -4.123105626 Reorder the terms: -3 + u = -4.123105626 Solving -3 + u = -4.123105626 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + u = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + u = -4.123105626 + 3 u = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 u = -1.123105626 Simplifying u = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. u = {7.123105626, -1.123105626}

See similar equations:

| 5w-5=w+7 | | 8-2=5+x | | 15x+20-45x+45=5x+65 | | 22x-3=18x+30 | | 4/3r=12 | | -10+2x-18=6 | | 2x+3=3x-8 | | x^6-2x^3-15=0 | | 8h^2+9h-6=0 | | 2c=5 | | x+5/3=2x-2/5 | | 6.2+1.7n=1.6 | | 176-5x=31x+24 | | -2(5x-1)=3(x+1) | | (y+9)(y-1)=0 | | 1/2*(4x-6)=11 | | 8x-17=-1 | | 31+27x-28x=2x+40 | | 2y^2+7y-3=0 | | x+(x/9)=0,9 | | 6(b-8)+5b=-144 | | 2x^2-4x-15=-5 | | g^2*g^6= | | x=6-8(9) | | 3y+6=-2 | | x^2=12x-11 | | x=6-8(13) | | 13-15/13 | | 8g+(-5d)= | | 6x^2+12x-40=8 | | b^2-49= | | 4/5x^2-4x+1=0 |

Equations solver categories