12p^2-11p-21=0

Simple and best practice solution for 12p^2-11p-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 12p^2-11p-21=0 equation:


Simplifying
12p2 + -11p + -21 = 0

Reorder the terms:
-21 + -11p + 12p2 = 0

Solving
-21 + -11p + 12p2 = 0

Solving for variable 'p'.

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

Divide each side by '12'.
-1.75 + -0.9166666667p + p2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -0.9166666667p + 1.75 + p2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -0.9166666667p + p2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -0.9166666667p + p2 = 0 + 1.75
-0.9166666667p + p2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-0.9166666667p + p2 = 1.75

The p term is -0.9166666667p.  Take half its coefficient (-0.4583333334).
Square it (0.2100694445) and add it to both sides.

Add '0.2100694445' to each side of the equation.
-0.9166666667p + 0.2100694445 + p2 = 1.75 + 0.2100694445

Reorder the terms:
0.2100694445 + -0.9166666667p + p2 = 1.75 + 0.2100694445

Combine like terms: 1.75 + 0.2100694445 = 1.9600694445
0.2100694445 + -0.9166666667p + p2 = 1.9600694445

Factor a perfect square on the left side:
(p + -0.4583333334)(p + -0.4583333334) = 1.9600694445

Calculate the square root of the right side: 1.400024801

Break this problem into two subproblems by setting 
(p + -0.4583333334) equal to 1.400024801 and -1.400024801.

Subproblem 1

p + -0.4583333334 = 1.400024801 Simplifying p + -0.4583333334 = 1.400024801 Reorder the terms: -0.4583333334 + p = 1.400024801 Solving -0.4583333334 + p = 1.400024801 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4583333334' to each side of the equation. -0.4583333334 + 0.4583333334 + p = 1.400024801 + 0.4583333334 Combine like terms: -0.4583333334 + 0.4583333334 = 0.0000000000 0.0000000000 + p = 1.400024801 + 0.4583333334 p = 1.400024801 + 0.4583333334 Combine like terms: 1.400024801 + 0.4583333334 = 1.8583581344 p = 1.8583581344 Simplifying p = 1.8583581344

Subproblem 2

p + -0.4583333334 = -1.400024801 Simplifying p + -0.4583333334 = -1.400024801 Reorder the terms: -0.4583333334 + p = -1.400024801 Solving -0.4583333334 + p = -1.400024801 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4583333334' to each side of the equation. -0.4583333334 + 0.4583333334 + p = -1.400024801 + 0.4583333334 Combine like terms: -0.4583333334 + 0.4583333334 = 0.0000000000 0.0000000000 + p = -1.400024801 + 0.4583333334 p = -1.400024801 + 0.4583333334 Combine like terms: -1.400024801 + 0.4583333334 = -0.9416914676 p = -0.9416914676 Simplifying p = -0.9416914676

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.8583581344, -0.9416914676}

See similar equations:

| X(2x+1)(3x+5)=0 | | 3x-3y=-7 | | (14a+24)=(2x-16) | | 2x^2+9x-19=0 | | 2(x-8)=5+9x | | x^2+12x+54=0 | | 0.04x-0.07(3x+400)=-40 | | 9/10b*5/1 | | (b-1)+b(b+2)=11 | | 4(5(2)+2)=48 | | 4x+7=4(x+1) | | x+5.4=2.1 | | 5-5/6=x | | X^2-4=84 | | 2m-1/19=m/0 | | x^6=8-2x^3 | | -5(2t-4)+8t=3t-9 | | 7n+11=4x-2 | | 3x+5+7x+15=180 | | x+2.7=-6.8 | | -5-4*2= | | -1/2x-3=6 | | 9w/6 | | x+6.1=-5.3 | | -2+-3+-6=n+12 | | 3x-3/5y=5 | | 6r=-r^2 | | 3(-3x-4)=60 | | 6r=r^2 | | 360+n=120 | | (t-11)+t+(t+17)=282 | | 10x-18=10x-18 |

Equations solver categories