5u^2+9u=4

Simple and best practice solution for 5u^2+9u=4 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+9u=4 equation:


Simplifying
5u2 + 9u = 4

Reorder the terms:
9u + 5u2 = 4

Solving
9u + 5u2 = 4

Solving for variable 'u'.

Reorder the terms:
-4 + 9u + 5u2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 9u + 5u2 = 0

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

Divide each side by '5'.
-0.8 + 1.8u + u2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 1.8u + 0.8 + u2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 1.8u + u2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 1.8u + u2 = 0 + 0.8
1.8u + u2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
1.8u + u2 = 0.8

The u term is 1.8u.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8u + 0.81 + u2 = 0.8 + 0.81

Reorder the terms:
0.81 + 1.8u + u2 = 0.8 + 0.81

Combine like terms: 0.8 + 0.81 = 1.61
0.81 + 1.8u + u2 = 1.61

Factor a perfect square on the left side:
(u + 0.9)(u + 0.9) = 1.61

Calculate the square root of the right side: 1.268857754

Break this problem into two subproblems by setting 
(u + 0.9) equal to 1.268857754 and -1.268857754.

Subproblem 1

u + 0.9 = 1.268857754 Simplifying u + 0.9 = 1.268857754 Reorder the terms: 0.9 + u = 1.268857754 Solving 0.9 + u = 1.268857754 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + u = 1.268857754 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + u = 1.268857754 + -0.9 u = 1.268857754 + -0.9 Combine like terms: 1.268857754 + -0.9 = 0.368857754 u = 0.368857754 Simplifying u = 0.368857754

Subproblem 2

u + 0.9 = -1.268857754 Simplifying u + 0.9 = -1.268857754 Reorder the terms: 0.9 + u = -1.268857754 Solving 0.9 + u = -1.268857754 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + u = -1.268857754 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + u = -1.268857754 + -0.9 u = -1.268857754 + -0.9 Combine like terms: -1.268857754 + -0.9 = -2.168857754 u = -2.168857754 Simplifying u = -2.168857754

Solution

The solution to the problem is based on the solutions from the subproblems. u = {0.368857754, -2.168857754}

See similar equations:

| y=-2x+19graph | | 180-x=2(180-(90-x))-36 | | n/4+1=2n/5+6 | | 3(x+1)-4=-2(2-x)+3+x | | 3k/2+1/5=k/5-2/3 | | .000024=4x^3 | | 3x-5=6x-7 | | 3x-8+2x=7x+5-2x | | (x+8)-14=-15 | | 2/3a+a | | x/4+2/3=x/3+1/4 | | 10-10x=1-9z | | 12x-x^3=0 | | 0.05x^2+x=20 | | 2(x-3)=4x+6 | | 2(3x+8)=3(2x+4) | | 6x/5-3x/2=6 | | k/6x30=25 | | 9m/2-6=3m/2+4 | | .50=4x^3 | | 0.000024=4x^3 | | 1/3p-p=4 | | p/2+6=p/4-7/3 | | 8x+3x+10x=8+3+6 | | -9x+1=x-19 | | 443x+2=77 | | 443x+2=5 | | -3x-4=16+1 | | 8x^6-40x^4= | | 4-6(x+2)=10 | | 2(7x)+2x=64 | | 5x-16=-16 |

Equations solver categories