7m^2-2m-8=0

Simple and best practice solution for 7m^2-2m-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 7m^2-2m-8=0 equation:


Simplifying
7m2 + -2m + -8 = 0

Reorder the terms:
-8 + -2m + 7m2 = 0

Solving
-8 + -2m + 7m2 = 0

Solving for variable 'm'.

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

Divide each side by '7'.
-1.142857143 + -0.2857142857m + m2 = 0

Move the constant term to the right:

Add '1.142857143' to each side of the equation.
-1.142857143 + -0.2857142857m + 1.142857143 + m2 = 0 + 1.142857143

Reorder the terms:
-1.142857143 + 1.142857143 + -0.2857142857m + m2 = 0 + 1.142857143

Combine like terms: -1.142857143 + 1.142857143 = 0.000000000
0.000000000 + -0.2857142857m + m2 = 0 + 1.142857143
-0.2857142857m + m2 = 0 + 1.142857143

Combine like terms: 0 + 1.142857143 = 1.142857143
-0.2857142857m + m2 = 1.142857143

The m term is -0.2857142857m.  Take half its coefficient (-0.1428571429).
Square it (0.02040816328) and add it to both sides.

Add '0.02040816328' to each side of the equation.
-0.2857142857m + 0.02040816328 + m2 = 1.142857143 + 0.02040816328

Reorder the terms:
0.02040816328 + -0.2857142857m + m2 = 1.142857143 + 0.02040816328

Combine like terms: 1.142857143 + 0.02040816328 = 1.16326530628
0.02040816328 + -0.2857142857m + m2 = 1.16326530628

Factor a perfect square on the left side:
(m + -0.1428571429)(m + -0.1428571429) = 1.16326530628

Calculate the square root of the right side: 1.078547777

Break this problem into two subproblems by setting 
(m + -0.1428571429) equal to 1.078547777 and -1.078547777.

Subproblem 1

m + -0.1428571429 = 1.078547777 Simplifying m + -0.1428571429 = 1.078547777 Reorder the terms: -0.1428571429 + m = 1.078547777 Solving -0.1428571429 + m = 1.078547777 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.1428571429' to each side of the equation. -0.1428571429 + 0.1428571429 + m = 1.078547777 + 0.1428571429 Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000 0.0000000000 + m = 1.078547777 + 0.1428571429 m = 1.078547777 + 0.1428571429 Combine like terms: 1.078547777 + 0.1428571429 = 1.2214049199 m = 1.2214049199 Simplifying m = 1.2214049199

Subproblem 2

m + -0.1428571429 = -1.078547777 Simplifying m + -0.1428571429 = -1.078547777 Reorder the terms: -0.1428571429 + m = -1.078547777 Solving -0.1428571429 + m = -1.078547777 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.1428571429' to each side of the equation. -0.1428571429 + 0.1428571429 + m = -1.078547777 + 0.1428571429 Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000 0.0000000000 + m = -1.078547777 + 0.1428571429 m = -1.078547777 + 0.1428571429 Combine like terms: -1.078547777 + 0.1428571429 = -0.9356906341 m = -0.9356906341 Simplifying m = -0.9356906341

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.2214049199, -0.9356906341}

See similar equations:

| -33=-7a-5 | | -11=2.5x-9 | | 3y(y+1)=-(6y+4)+y | | X^2=90-2x | | (6-r)(6+r)= | | 4n-3(n-7)=4+2n | | 4(y-1)=2y+10 | | 2x^2+3x=3x^2+1-x^2 | | 21+8x=27+6x | | 8z-5=-3 | | n^2-4n=21 | | q-11=-9 | | 21+q(5-q)-5q= | | 3x+1+4x=36 | | x^2-6x-100=0 | | 7m^2-2m=8 | | -1=1 | | 15+3y=6 | | 6c^2-5c-6=0 | | x+7(8-9x)-8=5+6x-8 | | 27+3x=-x+21 | | 2x+25=4x+5 | | 4x^2+2x=42 | | (5x-1)+(4x)+(x)=180 | | (15+2x)(2+3x)= | | 70-2=97-5x | | 6c^2-5c=6 | | 10x-1=180 | | 2u+v+3u-5v= | | X^2+2x=42 | | 0=5x^2-39x-8 | | 10x-24=6x |

Equations solver categories