m^4-18m^2=81

Simple and best practice solution for m^4-18m^2=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 m^4-18m^2=81 equation:


Simplifying
m4 + -18m2 = 81

Reorder the terms:
-18m2 + m4 = 81

Solving
-18m2 + m4 = 81

Solving for variable 'm'.

Reorder the terms:
-81 + -18m2 + m4 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + -18m2 + m4 = 0

Begin completing the square.

Move the constant term to the right:

Add '81' to each side of the equation.
-81 + -18m2 + 81 + m4 = 0 + 81

Reorder the terms:
-81 + 81 + -18m2 + m4 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + -18m2 + m4 = 0 + 81
-18m2 + m4 = 0 + 81

Combine like terms: 0 + 81 = 81
-18m2 + m4 = 81

The m term is -18m2.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18m2 + 81 + m4 = 81 + 81

Reorder the terms:
81 + -18m2 + m4 = 81 + 81

Combine like terms: 81 + 81 = 162
81 + -18m2 + m4 = 162

Factor a perfect square on the left side:
(m2 + -9)(m2 + -9) = 162

Calculate the square root of the right side: 12.727922061

Break this problem into two subproblems by setting 
(m2 + -9) equal to 12.727922061 and -12.727922061.

Subproblem 1

m2 + -9 = 12.727922061 Simplifying m2 + -9 = 12.727922061 Reorder the terms: -9 + m2 = 12.727922061 Solving -9 + m2 = 12.727922061 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + m2 = 12.727922061 + 9 Combine like terms: -9 + 9 = 0 0 + m2 = 12.727922061 + 9 m2 = 12.727922061 + 9 Combine like terms: 12.727922061 + 9 = 21.727922061 m2 = 21.727922061 Simplifying m2 = 21.727922061 Take the square root of each side: m = {-4.661321922, 4.661321922}

Subproblem 2

m2 + -9 = -12.727922061 Simplifying m2 + -9 = -12.727922061 Reorder the terms: -9 + m2 = -12.727922061 Solving -9 + m2 = -12.727922061 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + m2 = -12.727922061 + 9 Combine like terms: -9 + 9 = 0 0 + m2 = -12.727922061 + 9 m2 = -12.727922061 + 9 Combine like terms: -12.727922061 + 9 = -3.727922061 m2 = -3.727922061 Simplifying m2 = -3.727922061 Reorder the terms: 3.727922061 + m2 = -3.727922061 + 3.727922061 Combine like terms: -3.727922061 + 3.727922061 = 0.000000000 3.727922061 + m2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

See similar equations:

| 3x+15=3+6x-6 | | 3X^2-9X^2+2=0 | | 8(u-2)= | | 8x+13=2x-35 | | (x+22)+(x+22)+2x+90+90=720 | | 7x+25=4x+109 | | f(x)=2x^2+6x-140 | | 40+14j=2-4j-13 | | 3x-10=2x+32 | | 8-7x-2=-39+3x-15 | | 2/2x=3 | | an=8n-3 | | y-0.75y=1150 | | M/-7• | | x+(x+3)=120 | | 3x+2(-2x-34)=-62 | | 31+4x=55 | | 12-7x=-9x | | 2x-1+y-1=x+4+3y-11 | | 100x+50=y | | 5b+10a= | | -1(x+4)=6 | | 15x=4-(-11) | | y=1/5x=3,4 | | 30(x+5)=510 | | 259x-26=2 | | -8=-6x-2(-x-14) | | 18ln(x)-x^2+16x-15=0 | | 60x+75x=95x+40x | | 19x+5=80 | | 50x^2+40x=0 | | -5x(-6)= |

Equations solver categories