p^2+8p-81=10

Simple and best practice solution for p^2+8p-81=10 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 p^2+8p-81=10 equation:


Simplifying
p2 + 8p + -81 = 10

Reorder the terms:
-81 + 8p + p2 = 10

Solving
-81 + 8p + p2 = 10

Solving for variable 'p'.

Reorder the terms:
-81 + -10 + 8p + p2 = 10 + -10

Combine like terms: -81 + -10 = -91
-91 + 8p + p2 = 10 + -10

Combine like terms: 10 + -10 = 0
-91 + 8p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '91' to each side of the equation.
-91 + 8p + 91 + p2 = 0 + 91

Reorder the terms:
-91 + 91 + 8p + p2 = 0 + 91

Combine like terms: -91 + 91 = 0
0 + 8p + p2 = 0 + 91
8p + p2 = 0 + 91

Combine like terms: 0 + 91 = 91
8p + p2 = 91

The p term is 8p.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8p + 16 + p2 = 91 + 16

Reorder the terms:
16 + 8p + p2 = 91 + 16

Combine like terms: 91 + 16 = 107
16 + 8p + p2 = 107

Factor a perfect square on the left side:
(p + 4)(p + 4) = 107

Calculate the square root of the right side: 10.344080433

Break this problem into two subproblems by setting 
(p + 4) equal to 10.344080433 and -10.344080433.

Subproblem 1

p + 4 = 10.344080433 Simplifying p + 4 = 10.344080433 Reorder the terms: 4 + p = 10.344080433 Solving 4 + p = 10.344080433 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + p = 10.344080433 + -4 Combine like terms: 4 + -4 = 0 0 + p = 10.344080433 + -4 p = 10.344080433 + -4 Combine like terms: 10.344080433 + -4 = 6.344080433 p = 6.344080433 Simplifying p = 6.344080433

Subproblem 2

p + 4 = -10.344080433 Simplifying p + 4 = -10.344080433 Reorder the terms: 4 + p = -10.344080433 Solving 4 + p = -10.344080433 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + p = -10.344080433 + -4 Combine like terms: 4 + -4 = 0 0 + p = -10.344080433 + -4 p = -10.344080433 + -4 Combine like terms: -10.344080433 + -4 = -14.344080433 p = -14.344080433 Simplifying p = -14.344080433

Solution

The solution to the problem is based on the solutions from the subproblems. p = {6.344080433, -14.344080433}

See similar equations:

| x+3-1=7 | | 17a+18b-8= | | 3t-9=27 | | 2(x-3)-3(x-2)=(x+2)-(x-2) | | 4x-3=32x+4 | | k^2+14k-77=-5 | | 3(9g-8)-12=72 | | 3t-6pt+t-5pt= | | 3(x-4)+2=-2 | | 22-2x=4x-8 | | 2+3z=17 | | 0.1x+0.7y=3.1 | | 8(5-2x)=24 | | -8h+7g= | | 5(x+1)=y+6 | | 5-8c-2+3-11+4c= | | X(x-1)=x-x | | 75-9h=5(-4+2) | | 49n^2-1=80 | | 12b^2-20b= | | 7a-4a-2a-7b= | | 10x+3Y=61 | | 8x+2-2(-4x-1)=2(x-3) | | 4(2a+3)=18 | | 6(3-x)=24 | | 7x^2+7=315 | | 7x^2-55x+140=0 | | 9z^2=100 | | 5-(2+3)4= | | v^2+4=54 | | 6-13+y=-4+1 | | 2u+6=-8(u+8) |

Equations solver categories