x(5x+9)=4

Simple and best practice solution for x(5x+9)=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 x(5x+9)=4 equation:


Simplifying
x(5x + 9) = 4

Reorder the terms:
x(9 + 5x) = 4
(9 * x + 5x * x) = 4
(9x + 5x2) = 4

Solving
9x + 5x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + 9x + 5x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 9x + 5x2 = 0

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

Divide each side by '5'.
-0.8 + 1.8x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 1.8x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 1.8x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 1.8x + x2 = 0 + 0.8
1.8x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
1.8x + x2 = 0.8

The x term is 1.8x.  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.
1.8x + 0.81 + x2 = 0.8 + 0.81

Reorder the terms:
0.81 + 1.8x + x2 = 0.8 + 0.81

Combine like terms: 0.8 + 0.81 = 1.61
0.81 + 1.8x + x2 = 1.61

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

Calculate the square root of the right side: 1.268857754

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

Subproblem 1

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

Subproblem 2

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

Solution

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

See similar equations:

| X+97=220 | | 3[8+x]-1=29 | | 2.00=x-90/10 | | 400-15a=1000-40a | | 12/5-13/4= | | 0.10y+0.30(60-y)=0.25(60) | | 5y+5x=9.80 | | 4y-9x+7=0 | | log(x+48)5=10 | | Yt-w+p=n | | 86=5u+16 | | 741/x=19 | | 7z+3-8z=-3 | | 165+5a=75+15a | | 741/x= | | -7(x-4)+8x=12-14 | | 9x+8-2x=29 | | m/7=34/13 | | 4y+9-8y=-3 | | 0.10(20)-0.10z=0.08(20) | | 2x+5-9x=-44 | | 2y+7-9y=-28 | | x-2(2x+2)=4(4+5) | | (y+5.3)+7.2y-9=6.2y+n | | 2n+27=84 | | m=5/7(0,4) | | m=5/7 | | .66*n+2=-.66(n-9) | | 89n=178 | | 24/8.3 | | x-2(x-2+x+4)=4(4+5) | | x(x+4)=5(5+7) |

Equations solver categories