8x^2-18x-81=0

Simple and best practice solution for 8x^2-18x-81=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 8x^2-18x-81=0 equation: 


Simplifying
8x2 + -18x + -81 = 0

Reorder the terms:
-81 + -18x + 8x2 = 0

Solving
-81 + -18x + 8x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -4x)(9 + -2x) = 0


Subproblem 1
Set the factor '(-9 + -4x)' equal to zero and attempt to solve:

Simplifying
-9 + -4x = 0

Solving
-9 + -4x = 0

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + -4x = 0 + 9

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

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

Divide each side by '-4'.
x = -2.25

Simplifying
x = -2.25

Subproblem 2
Set the factor '(9 + -2x)' equal to zero and attempt to solve:

Simplifying
9 + -2x = 0

Solving
9 + -2x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -2x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2x = 0 + -9
-2x = 0 + -9

Combine like terms: 0 + -9 = -9
-2x = -9

Divide each side by '-2'.
x = 4.5

Simplifying
x = 4.5
Solution
x = {-2.25, 4.5}

See similar equations:

| (8x^3+2x^2-5x+2)-(2x^4+5x^3+x-5)= | | -(4x-2)+2x-5=-3 | | z^2/8x5/8 | | 9xy(2/3x) | | 9xy(2/3x)^3 | | (5x+1)*7=2x+3 | | B(x+a)=ax+d | | -(x^4)= | | 3x=36000cm^2-4y | | -(x^3)= | | (1/9)(1/8)= | | 2(x+5)+5=4x-2(-5+x) | | u^2-12u+35=0 | | (5x+1)=2x+3 | | 6(2n-3)=(2n+5)+7 | | 4b-15-46=24 | | q(p-q)= | | a-20=50 | | 2(3n-5)=(3n+3)+1 | | 5p+7-5=-7(p-3) | | -2(t-4)+5t=9t-7 | | 0.08(y-4)+0.12y=0.10y-0.01(30) | | 11x=133 | | 10z-55=75 | | 7(5x+1)=2x+3 | | x/25=10/15 | | x/25=10/25 | | X^2x-3=0 | | 2(x+3)-7x=18-5(x+14) | | X^2+20x-24=0 | | x^2-71=0 | | 13z=12/8 |

Equations solver categories