5m^2+5m-21=0

Simple and best practice solution for 5m^2+5m-21=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 5m^2+5m-21=0 equation:


Simplifying
5m2 + 5m + -21 = 0

Reorder the terms:
-21 + 5m + 5m2 = 0

Solving
-21 + 5m + 5m2 = 0

Solving for variable 'm'.

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

Divide each side by '5'.
-4.2 + m + m2 = 0

Move the constant term to the right:

Add '4.2' to each side of the equation.
-4.2 + m + 4.2 + m2 = 0 + 4.2

Reorder the terms:
-4.2 + 4.2 + m + m2 = 0 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + m + m2 = 0 + 4.2
m + m2 = 0 + 4.2

Combine like terms: 0 + 4.2 = 4.2
m + m2 = 4.2

The m term is m.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + m2 = 4.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + m2 = 4.2 + 0.25

Combine like terms: 4.2 + 0.25 = 4.45
1.25 + m2 = 4.45

Factor a perfect square on the left side:
(m + 0.5)(m + 0.5) = 4.45

Calculate the square root of the right side: 2.109502311

Break this problem into two subproblems by setting 
(m + 0.5) equal to 2.109502311 and -2.109502311.

Subproblem 1

m + 0.5 = 2.109502311 Simplifying m + 0.5 = 2.109502311 Reorder the terms: 0.5 + m = 2.109502311 Solving 0.5 + m = 2.109502311 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = 2.109502311 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = 2.109502311 + -0.5 m = 2.109502311 + -0.5 Combine like terms: 2.109502311 + -0.5 = 1.609502311 m = 1.609502311 Simplifying m = 1.609502311

Subproblem 2

m + 0.5 = -2.109502311 Simplifying m + 0.5 = -2.109502311 Reorder the terms: 0.5 + m = -2.109502311 Solving 0.5 + m = -2.109502311 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + m = -2.109502311 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + m = -2.109502311 + -0.5 m = -2.109502311 + -0.5 Combine like terms: -2.109502311 + -0.5 = -2.609502311 m = -2.609502311 Simplifying m = -2.609502311

Solution

The solution to the problem is based on the solutions from the subproblems. m = {1.609502311, -2.609502311}

See similar equations:

| 2e^3x+1=e^2 | | 45=y | | 3(3x+6)=8x+12 | | f(x)=2x^2+8x-20 | | 0.5=4.1x-2.6x-8 | | 50+5k=40 | | 8x+3=5-10x | | -4.9=5.1-2y | | 8x+3=5-10 | | 9c^3+12c^3+18c-9= | | 10x+12y=162 | | 3x^2+2xy+3y^2=4 | | (9x-1)=144 | | 2x^2+84x-5544=0 | | 37+13j=27j-5 | | -3(y+3)=5y-5+2(3y+4) | | 3a+13=10a-8 | | 2x^2+10=-1 | | 2/3w-1/4=(w-1/4) | | (3y-5y^3+4y^2-13)-(2y^2-9y^3+y-14)= | | -3y=5x-15 | | -216-(-60b)+8=32 | | -208+(-60b)=32 | | x*8+5=-1.2 | | 8+x=19-2 | | (X+13)(x)=(x+1)(x+10) | | X^2+y^2+2x-6y-6=0 | | 5[12-(6-3a)-2a]=(1-a) | | 15x+4y=-4 | | (-216--60b)+8=32 | | 2y^2=210 | | -9x-6=5-1x |

Equations solver categories