k^4-81=

Simple and best practice solution for k^4-81= 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 k^4-81= equation:


Simplifying
k4 + -81 = 0

Reorder the terms:
-81 + k4 = 0

Solving
-81 + k4 = 0

Solving for variable 'k'.

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

Add '81' to each side of the equation.
-81 + 81 + k4 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + k4 = 0 + 81
k4 = 0 + 81

Combine like terms: 0 + 81 = 81
k4 = 81

Simplifying
k4 = 81

Reorder the terms:
-81 + k4 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + k4 = 0

Factor a difference between two squares.
(9 + k2)(-9 + k2) = 0

Factor a difference between two squares.
(9 + k2)((3 + k)(-3 + k)) = 0

Subproblem 1

Set the factor '(9 + k2)' equal to zero and attempt to solve: Simplifying 9 + k2 = 0 Solving 9 + k2 = 0 Move all terms containing k to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + k2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + k2 = 0 + -9 k2 = 0 + -9 Combine like terms: 0 + -9 = -9 k2 = -9 Simplifying k2 = -9 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(3 + k)' equal to zero and attempt to solve: Simplifying 3 + k = 0 Solving 3 + k = 0 Move all terms containing k to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + k = 0 + -3 Combine like terms: 3 + -3 = 0 0 + k = 0 + -3 k = 0 + -3 Combine like terms: 0 + -3 = -3 k = -3 Simplifying k = -3

Subproblem 3

Set the factor '(-3 + k)' equal to zero and attempt to solve: Simplifying -3 + k = 0 Solving -3 + k = 0 Move all terms containing k to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + k = 0 + 3 Combine like terms: -3 + 3 = 0 0 + k = 0 + 3 k = 0 + 3 Combine like terms: 0 + 3 = 3 k = 3 Simplifying k = 3

Solution

k = {-3, 3}

See similar equations:

| 3a^2+10a-2=0 | | 3c+2(3d+4)= | | .65=log(x) | | 4-d=-d(d-4) | | 200+16x=500-16x | | 2(3m+2)=6m-3 | | 16w=-72 | | 30m^2-31m-6= | | 5u-24=3u | | 6x^2-2=-x | | -3(3x-7)=4 | | 64x+30x=400+30x | | 5xy+25y= | | f(w)=2w^2-w | | 4x+20=5+5x | | 4x(x-5)-3(x+6)= | | 2(n-31)=3n | | 9x-12=8x+14 | | 2(4x+5)+2(3x-1)=8 | | 5u-24=3 | | (-4-7i)(-1-i)=0 | | x=200+.8(x) | | 3x+5+5x-25= | | 33=20+x | | 3U^2+14U+16= | | 9(x-3)+5=-22 | | 7w-4w=24 | | 12-y-8y=-24 | | 6t+3(5t-4)=9(2t-5) | | 2(b-4)-6(b+8)=12(b+4)-(8b-6) | | (2i)(-4i)(5-i)=0 | | 7x-1=7(x-1) |

Equations solver categories