5z^2-18z+8=0

Simple and best practice solution for 5z^2-18z+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 5z^2-18z+8=0 equation:


Simplifying
5z2 + -18z + 8 = 0

Reorder the terms:
8 + -18z + 5z2 = 0

Solving
8 + -18z + 5z2 = 0

Solving for variable 'z'.

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

Divide each side by '5'.
1.6 + -3.6z + z2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -3.6z + -1.6 + z2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -3.6z + z2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -3.6z + z2 = 0 + -1.6
-3.6z + z2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-3.6z + z2 = -1.6

The z term is -3.6z.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6z + 3.24 + z2 = -1.6 + 3.24

Reorder the terms:
3.24 + -3.6z + z2 = -1.6 + 3.24

Combine like terms: -1.6 + 3.24 = 1.64
3.24 + -3.6z + z2 = 1.64

Factor a perfect square on the left side:
(z + -1.8)(z + -1.8) = 1.64

Calculate the square root of the right side: 1.280624847

Break this problem into two subproblems by setting 
(z + -1.8) equal to 1.280624847 and -1.280624847.

Subproblem 1

z + -1.8 = 1.280624847 Simplifying z + -1.8 = 1.280624847 Reorder the terms: -1.8 + z = 1.280624847 Solving -1.8 + z = 1.280624847 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + z = 1.280624847 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + z = 1.280624847 + 1.8 z = 1.280624847 + 1.8 Combine like terms: 1.280624847 + 1.8 = 3.080624847 z = 3.080624847 Simplifying z = 3.080624847

Subproblem 2

z + -1.8 = -1.280624847 Simplifying z + -1.8 = -1.280624847 Reorder the terms: -1.8 + z = -1.280624847 Solving -1.8 + z = -1.280624847 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + z = -1.280624847 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + z = -1.280624847 + 1.8 z = -1.280624847 + 1.8 Combine like terms: -1.280624847 + 1.8 = 0.519375153 z = 0.519375153 Simplifying z = 0.519375153

Solution

The solution to the problem is based on the solutions from the subproblems. z = {3.080624847, 0.519375153}

See similar equations:

| 6s-8=-6+7s | | 7x-9=-39+2x | | (r+f)(z-2)+(r+f)(z+9)= | | 2+3x+8y=0 | | (-1.3333333w)-(2.5)=(-1.8) | | 4d^2p^2-12dp= | | 20=x^2-x | | r^5-6r^4-8r^3= | | 3(5x-1)-x+4= | | (3z-8)(9+z)=0 | | x^2=5x+9 | | 5y-2+43=2y+50 | | 5c^4-3125= | | 3x-5=7+7 | | 72-15a-3a^2= | | v^5-8v^4+16v^3= | | X=3(x-a) | | 2x^2+42x+1080=0 | | a^3-9a^2-9a+81= | | 0-1=1 | | 5w^2-14w+8= | | 37x+y*2= | | 10t^2-29t=-10 | | -0.5-4= | | 0=-101x^3+188x^2+48x-48 | | 2x^2+42x+272=0 | | 5x-4(x+9)=2x+3 | | 8a-3(2a+5)=3 | | -13x^2+1430x-36400=0 | | x^4-x^3+9x^2-24x+2=0 | | 12x+20y+9= | | 100=-(x-1+4)(x-6) |

Equations solver categories