p^2-8p+21=26

Simple and best practice solution for p^2-8p+21=26 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+21=26 equation:


Simplifying
p2 + -8p + 21 = 26

Reorder the terms:
21 + -8p + p2 = 26

Solving
21 + -8p + p2 = 26

Solving for variable 'p'.

Reorder the terms:
21 + -26 + -8p + p2 = 26 + -26

Combine like terms: 21 + -26 = -5
-5 + -8p + p2 = 26 + -26

Combine like terms: 26 + -26 = 0
-5 + -8p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -8p + 5 + p2 = 0 + 5

Reorder the terms:
-5 + 5 + -8p + p2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -8p + p2 = 0 + 5
-8p + p2 = 0 + 5

Combine like terms: 0 + 5 = 5
-8p + p2 = 5

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 = 5 + 16

Reorder the terms:
16 + -8p + p2 = 5 + 16

Combine like terms: 5 + 16 = 21
16 + -8p + p2 = 21

Factor a perfect square on the left side:
(p + -4)(p + -4) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(p + -4) equal to 4.582575695 and -4.582575695.

Subproblem 1

p + -4 = 4.582575695 Simplifying p + -4 = 4.582575695 Reorder the terms: -4 + p = 4.582575695 Solving -4 + p = 4.582575695 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 = 4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + p = 4.582575695 + 4 p = 4.582575695 + 4 Combine like terms: 4.582575695 + 4 = 8.582575695 p = 8.582575695 Simplifying p = 8.582575695

Subproblem 2

p + -4 = -4.582575695 Simplifying p + -4 = -4.582575695 Reorder the terms: -4 + p = -4.582575695 Solving -4 + p = -4.582575695 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 = -4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + p = -4.582575695 + 4 p = -4.582575695 + 4 Combine like terms: -4.582575695 + 4 = -0.582575695 p = -0.582575695 Simplifying p = -0.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. p = {8.582575695, -0.582575695}

See similar equations:

| -14n+15=-13n | | 4-4*5+3=x | | -12n+16n^2=0 | | 2/t=t/-t6 | | 45=9/5x | | 6t=3t+4-t | | 80+-1x=90+-2x | | -19u=8-20u | | -8.3=y+3.7 | | Y/10=9/15 | | 2x(-1-x)=5x-2 | | -4.6q=-18-1.0q | | 3x-2y^7=-5 | | A=3.14d | | Y/5-2=y3-4 | | -x(0.5x-2)=0 | | 11y-15=10y | | Fx=3x^3+5x^2+2x+5 | | 2x+y^7=6 | | -x^2+8x=5 | | -27=-7x+3x+5 | | -372=6x+6(6x+15) | | -18j=-17-17j | | 3x-12=logx^1 | | 65=2.975+b | | 0.045x+5.401=0.03x+5.392 | | 11x-7=110 | | 9x+8-x=24-2x+40 | | -9+5x+4x+14= | | 2n+10n^2=0 | | (8-bx-3)+6b+12-10b= | | 4/b=28/35 |

Equations solver categories