p^2-4p-7=0

Simple and best practice solution for p^2-4p-7=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 p^2-4p-7=0 equation:


Simplifying
p2 + -4p + -7 = 0

Reorder the terms:
-7 + -4p + p2 = 0

Solving
-7 + -4p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -4p + 7 + p2 = 0 + 7

Reorder the terms:
-7 + 7 + -4p + p2 = 0 + 7

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

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

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 = 7 + 4

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

Combine like terms: 7 + 4 = 11
4 + -4p + p2 = 11

Factor a perfect square on the left side:
(p + -2)(p + -2) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(p + -2) equal to 3.31662479 and -3.31662479.

Subproblem 1

p + -2 = 3.31662479 Simplifying p + -2 = 3.31662479 Reorder the terms: -2 + p = 3.31662479 Solving -2 + p = 3.31662479 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 = 3.31662479 + 2 Combine like terms: -2 + 2 = 0 0 + p = 3.31662479 + 2 p = 3.31662479 + 2 Combine like terms: 3.31662479 + 2 = 5.31662479 p = 5.31662479 Simplifying p = 5.31662479

Subproblem 2

p + -2 = -3.31662479 Simplifying p + -2 = -3.31662479 Reorder the terms: -2 + p = -3.31662479 Solving -2 + p = -3.31662479 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 = -3.31662479 + 2 Combine like terms: -2 + 2 = 0 0 + p = -3.31662479 + 2 p = -3.31662479 + 2 Combine like terms: -3.31662479 + 2 = -1.31662479 p = -1.31662479 Simplifying p = -1.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. p = {5.31662479, -1.31662479}

See similar equations:

| 2y+70=4y+10 | | 8(y-3)-7y=8 | | 6-6n=-6n+2 | | 9-6t=-9-10+1 | | -20n+-30+2=-8 | | 5x+7=-4x-8 | | 2+3x=3x | | -21=-3a | | 5[x-8]+26=-9 | | 2+3=3x | | 0=8x-1(3-x) | | 6x+20=36 | | 7x+8=4x+2 | | -12=5x+-13 | | 5x+21=x+1 | | n^2-5n+2=4 | | 56=2w+2(2w-1) | | -7c+7c=0 | | 7/4x-4/5x=19/80 | | f(x)=3x^4-5x^2 | | b^2-4b-8=-3 | | 27-2-4-(-k-3)=-16-(-3k-4) | | -2u+2u=0 | | Y/4=-4 | | -65/24=5/6x-3/2-13/4x | | 7m^2-7=-133 | | x/10-21=-161 | | H^2+2H+22= | | 12x+4(1x-1)=108 | | 27-2-4-(-k-3)=-17 | | (3x)(6x)= | | -7=-n |

Equations solver categories