p^2-7p=28

Simple and best practice solution for p^2-7p=28 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^2-7p=28 equation:


Simplifying
p2 + -7p = 28

Reorder the terms:
-7p + p2 = 28

Solving
-7p + p2 = 28

Solving for variable 'p'.

Reorder the terms:
-28 + -7p + p2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -7p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -7p + 28 + p2 = 0 + 28

Reorder the terms:
-28 + 28 + -7p + p2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -7p + p2 = 0 + 28
-7p + p2 = 0 + 28

Combine like terms: 0 + 28 = 28
-7p + p2 = 28

The p term is -7p.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7p + 12.25 + p2 = 28 + 12.25

Reorder the terms:
12.25 + -7p + p2 = 28 + 12.25

Combine like terms: 28 + 12.25 = 40.25
12.25 + -7p + p2 = 40.25

Factor a perfect square on the left side:
(p + -3.5)(p + -3.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(p + -3.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

p + -3.5 = 6.34428877 Simplifying p + -3.5 = 6.34428877 Reorder the terms: -3.5 + p = 6.34428877 Solving -3.5 + p = 6.34428877 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + p = 6.34428877 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + p = 6.34428877 + 3.5 p = 6.34428877 + 3.5 Combine like terms: 6.34428877 + 3.5 = 9.84428877 p = 9.84428877 Simplifying p = 9.84428877

Subproblem 2

p + -3.5 = -6.34428877 Simplifying p + -3.5 = -6.34428877 Reorder the terms: -3.5 + p = -6.34428877 Solving -3.5 + p = -6.34428877 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + p = -6.34428877 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + p = -6.34428877 + 3.5 p = -6.34428877 + 3.5 Combine like terms: -6.34428877 + 3.5 = -2.84428877 p = -2.84428877 Simplifying p = -2.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. p = {9.84428877, -2.84428877}

See similar equations:

| (4x-1)/6+(2x+1)/2=2 | | 10x-9-9=14x-9+6x | | 15n+15+4n=130 | | x^2+7c+10=0 | | x+12=21 | | 4k^2-125=5k | | 7-k=5+3k | | x^2-8x*7=0 | | (x-y)(x^2+y^2)= | | -5t-14=2n | | ln(2x-3)=0 | | 2p^2-63=11p | | -2x-5-4=2x+12-x | | 5-9x=9x+21 | | 14m=-13 | | 1.666666667(3q+6)=8 | | (3x^4-5x^2-4)(-3x^3)= | | 6(2n-5)=-3(7-3n)+2n | | 276-4x=41x+16 | | 4(m+8)-12=4(m+5) | | 2.7-15p=30p-1.8 | | 18=0.5p+15 | | =-6x^2-23x-20 | | 30=6x-24+3r | | 4x(3y)= | | 11-9x=35-23x | | 8.5b-9.6=3.1b+1.2 | | =4x^2-19x+30 | | 123-2x=5x+18 | | 8x+3y=72 | | -24=5r | | E(26)=2n |

Equations solver categories