p^2-4p-91=7

Simple and best practice solution for p^2-4p-91=7 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^2-4p-91=7 equation:


Simplifying
p2 + -4p + -91 = 7

Reorder the terms:
-91 + -4p + p2 = 7

Solving
-91 + -4p + p2 = 7

Solving for variable 'p'.

Reorder the terms:
-91 + -7 + -4p + p2 = 7 + -7

Combine like terms: -91 + -7 = -98
-98 + -4p + p2 = 7 + -7

Combine like terms: 7 + -7 = 0
-98 + -4p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + -4p + 98 + p2 = 0 + 98

Reorder the terms:
-98 + 98 + -4p + p2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + -4p + p2 = 0 + 98
-4p + p2 = 0 + 98

Combine like terms: 0 + 98 = 98
-4p + p2 = 98

The p term is -4p.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4p + 4 + p2 = 98 + 4

Reorder the terms:
4 + -4p + p2 = 98 + 4

Combine like terms: 98 + 4 = 102
4 + -4p + p2 = 102

Factor a perfect square on the left side:
(p + -2)(p + -2) = 102

Calculate the square root of the right side: 10.099504938

Break this problem into two subproblems by setting 
(p + -2) equal to 10.099504938 and -10.099504938.

Subproblem 1

p + -2 = 10.099504938 Simplifying p + -2 = 10.099504938 Reorder the terms: -2 + p = 10.099504938 Solving -2 + p = 10.099504938 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + p = 10.099504938 + 2 Combine like terms: -2 + 2 = 0 0 + p = 10.099504938 + 2 p = 10.099504938 + 2 Combine like terms: 10.099504938 + 2 = 12.099504938 p = 12.099504938 Simplifying p = 12.099504938

Subproblem 2

p + -2 = -10.099504938 Simplifying p + -2 = -10.099504938 Reorder the terms: -2 + p = -10.099504938 Solving -2 + p = -10.099504938 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + p = -10.099504938 + 2 Combine like terms: -2 + 2 = 0 0 + p = -10.099504938 + 2 p = -10.099504938 + 2 Combine like terms: -10.099504938 + 2 = -8.099504938 p = -8.099504938 Simplifying p = -8.099504938

Solution

The solution to the problem is based on the solutions from the subproblems. p = {12.099504938, -8.099504938}

See similar equations:

| p^2-12p+23=0 | | 16x^2-24x+9=16 | | 5a-2b=3 | | 18x^2-25=0 | | 23x-12=16x+21 | | -2x+6=6x+3 | | 35x^2-21x=0 | | 10x+9-9X=12 | | 5(2z-1)-2(z+8)=6(z+1) | | -5(x+9)-44=2-61 | | 23x+8-25x=3-5 | | x/-8=-3-(-6) | | 9x+14-8=-6-13 | | 7-7=16x+5x | | 64=9t-17t | | 4x-11=57 | | 14-13=x/-4 | | tn=7n+3 | | 12x=9-(-15) | | 4w-10w=-48 | | 1/x-1-1/x=2/x | | y+3=5+8 | | -5-4=-2+x | | 21-42=3(x-1)-6 | | (27/4)/(15/8) | | -5(x+1)-18=15+2 | | 6y=5(y+16) | | -9-5=9x+3-8x | | 8x+4-7=13 | | x/33=-40+17 | | 4x-5(3x+10)=26 | | 30-12=3(x-7) |

Equations solver categories