4m^2-31m-42=0

Simple and best practice solution for 4m^2-31m-42=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 4m^2-31m-42=0 equation:


Simplifying
4m2 + -31m + -42 = 0

Reorder the terms:
-42 + -31m + 4m2 = 0

Solving
-42 + -31m + 4m2 = 0

Solving for variable 'm'.

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

Divide each side by '4'.
-10.5 + -7.75m + m2 = 0

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + -7.75m + 10.5 + m2 = 0 + 10.5

Reorder the terms:
-10.5 + 10.5 + -7.75m + m2 = 0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + -7.75m + m2 = 0 + 10.5
-7.75m + m2 = 0 + 10.5

Combine like terms: 0 + 10.5 = 10.5
-7.75m + m2 = 10.5

The m term is -7.75m.  Take half its coefficient (-3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
-7.75m + 15.015625 + m2 = 10.5 + 15.015625

Reorder the terms:
15.015625 + -7.75m + m2 = 10.5 + 15.015625

Combine like terms: 10.5 + 15.015625 = 25.515625
15.015625 + -7.75m + m2 = 25.515625

Factor a perfect square on the left side:
(m + -3.875)(m + -3.875) = 25.515625

Calculate the square root of the right side: 5.051299338

Break this problem into two subproblems by setting 
(m + -3.875) equal to 5.051299338 and -5.051299338.

Subproblem 1

m + -3.875 = 5.051299338 Simplifying m + -3.875 = 5.051299338 Reorder the terms: -3.875 + m = 5.051299338 Solving -3.875 + m = 5.051299338 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + m = 5.051299338 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + m = 5.051299338 + 3.875 m = 5.051299338 + 3.875 Combine like terms: 5.051299338 + 3.875 = 8.926299338 m = 8.926299338 Simplifying m = 8.926299338

Subproblem 2

m + -3.875 = -5.051299338 Simplifying m + -3.875 = -5.051299338 Reorder the terms: -3.875 + m = -5.051299338 Solving -3.875 + m = -5.051299338 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '3.875' to each side of the equation. -3.875 + 3.875 + m = -5.051299338 + 3.875 Combine like terms: -3.875 + 3.875 = 0.000 0.000 + m = -5.051299338 + 3.875 m = -5.051299338 + 3.875 Combine like terms: -5.051299338 + 3.875 = -1.176299338 m = -1.176299338 Simplifying m = -1.176299338

Solution

The solution to the problem is based on the solutions from the subproblems. m = {8.926299338, -1.176299338}

See similar equations:

| y=1.5+360 | | 2(n+73)=3(n-41) | | 14-8x=46 | | 8x+4=4x-15 | | 2-5(x-4)=42 | | -8=6x | | f(x)=x^4-4x^3+4x-1 | | 6(8-w)=2w | | 4x+5+x=6x-7-x | | 9=-10-9c-8 | | 8h-18=54 | | -8n+2=-6n-6 | | (x^2+9)=0 | | 8(r+3)=7(2-r) | | (5t-9)9=-9 | | a+b+c=30.5 | | C-3y=-9 | | -8n+2=6n-6 | | 6x=42-10x | | 6(v-14)=180 | | 12=-3+3w | | (x+10)=(y-40) | | -7(3x+2)=-21x-14 | | 11n=203-18n | | 8+5y=-2 | | 24-5v=18 | | 3g=9(4-g) | | (x^2+9)(x+9)=0 | | -7(5.5)-3= | | 5(x+9)-43= | | 53x^2-85x-130=0 | | 20=3w+2 |

Equations solver categories