5u^2-6u-9=0

Simple and best practice solution for 5u^2-6u-9=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 5u^2-6u-9=0 equation:


Simplifying
5u2 + -6u + -9 = 0

Reorder the terms:
-9 + -6u + 5u2 = 0

Solving
-9 + -6u + 5u2 = 0

Solving for variable 'u'.

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

Divide each side by '5'.
-1.8 + -1.2u + u2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -1.2u + 1.8 + u2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -1.2u + u2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -1.2u + u2 = 0 + 1.8
-1.2u + u2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-1.2u + u2 = 1.8

The u term is -1.2u.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2u + 0.36 + u2 = 1.8 + 0.36

Reorder the terms:
0.36 + -1.2u + u2 = 1.8 + 0.36

Combine like terms: 1.8 + 0.36 = 2.16
0.36 + -1.2u + u2 = 2.16

Factor a perfect square on the left side:
(u + -0.6)(u + -0.6) = 2.16

Calculate the square root of the right side: 1.469693846

Break this problem into two subproblems by setting 
(u + -0.6) equal to 1.469693846 and -1.469693846.

Subproblem 1

u + -0.6 = 1.469693846 Simplifying u + -0.6 = 1.469693846 Reorder the terms: -0.6 + u = 1.469693846 Solving -0.6 + u = 1.469693846 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + u = 1.469693846 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + u = 1.469693846 + 0.6 u = 1.469693846 + 0.6 Combine like terms: 1.469693846 + 0.6 = 2.069693846 u = 2.069693846 Simplifying u = 2.069693846

Subproblem 2

u + -0.6 = -1.469693846 Simplifying u + -0.6 = -1.469693846 Reorder the terms: -0.6 + u = -1.469693846 Solving -0.6 + u = -1.469693846 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + u = -1.469693846 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + u = -1.469693846 + 0.6 u = -1.469693846 + 0.6 Combine like terms: -1.469693846 + 0.6 = -0.869693846 u = -0.869693846 Simplifying u = -0.869693846

Solution

The solution to the problem is based on the solutions from the subproblems. u = {2.069693846, -0.869693846}

See similar equations:

| u/4-3.1=-15.9 | | 90=1/2n(n-3) | | 6!/2!4! | | 2u^2+u-7=0 | | 3h^2+9h+3=0 | | 1349=16s^2 | | f(x)=0.2x-(x+3) | | (2x-2000)*3=5000 | | f(x)=0.2x-in(x+3) | | -5/3u=30 | | 7u=-14/9 | | -6/5y=30 | | (x-3)(2x-1)+(x-3)(-x+5)=0 | | f(x)=Vx | | -2y+3(0)=4 | | 10y-11(0)=-4 | | g(x)=t^2 | | 10(2.3x+2.8)=10(-1.2x+9.8) | | 4x-25=51 | | 2y+5(5)-19=0 | | -4y+11(5)-67=0 | | 9/10-4/10=5/10-1/5=4/5 | | 700=x+x*1.2 | | 8(x+7)+3=-7(x-10)-5 | | 1.2*700= | | 700=x+(1.2*x) | | 700=x+1.2*x | | -2y-3(9y-1)=2+3(-5-y) | | W+36=1-4(w-5) | | 2(5y-1)+17=4(4y+4)+22 | | (3n^2+-0.75)=90 | | 4u+3=-21 |

Equations solver categories