x^2-x-72=1

Simple and best practice solution for x^2-x-72=1 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 x^2-x-72=1 equation:


Simplifying
x2 + -1x + -72 = 1

Reorder the terms:
-72 + -1x + x2 = 1

Solving
-72 + -1x + x2 = 1

Solving for variable 'x'.

Reorder the terms:
-72 + -1 + -1x + x2 = 1 + -1

Combine like terms: -72 + -1 = -73
-73 + -1x + x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-73 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '73' to each side of the equation.
-73 + -1x + 73 + x2 = 0 + 73

Reorder the terms:
-73 + 73 + -1x + x2 = 0 + 73

Combine like terms: -73 + 73 = 0
0 + -1x + x2 = 0 + 73
-1x + x2 = 0 + 73

Combine like terms: 0 + 73 = 73
-1x + x2 = 73

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 73 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 73 + 0.25

Combine like terms: 73 + 0.25 = 73.25
0.25 + -1x + x2 = 73.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 73.25

Calculate the square root of the right side: 8.558621384

Break this problem into two subproblems by setting 
(x + -0.5) equal to 8.558621384 and -8.558621384.

Subproblem 1

x + -0.5 = 8.558621384 Simplifying x + -0.5 = 8.558621384 Reorder the terms: -0.5 + x = 8.558621384 Solving -0.5 + x = 8.558621384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 8.558621384 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 8.558621384 + 0.5 x = 8.558621384 + 0.5 Combine like terms: 8.558621384 + 0.5 = 9.058621384 x = 9.058621384 Simplifying x = 9.058621384

Subproblem 2

x + -0.5 = -8.558621384 Simplifying x + -0.5 = -8.558621384 Reorder the terms: -0.5 + x = -8.558621384 Solving -0.5 + x = -8.558621384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -8.558621384 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -8.558621384 + 0.5 x = -8.558621384 + 0.5 Combine like terms: -8.558621384 + 0.5 = -8.058621384 x = -8.058621384 Simplifying x = -8.058621384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.058621384, -8.058621384}

See similar equations:

| .7(2x+2)=1.1-(x-6) | | m(12m+48)=60 | | .7(6x+4)=1.1-(x+2) | | 9x=8x-20 | | 10x-9-5x+1= | | -x-1+2x+5=x | | 6-2(x+1)=7+x | | 3u^2-14u+14=0 | | 6x(9-4)+11=0 | | X^3-4x^2-x+4=0 | | 3u^2-12u+14=0 | | (4b-570)+b=3840 | | 9y^2+21y+10=0 | | 44x(8+3)-3= | | -4x+2=-2(4x+7) | | 5x(8+3)-3= | | 5(2x-1)=45 | | 2.7x+4=7-0.3x | | 0.4(x-2)=9.6 | | 4x-9=15-2x | | 3x-7=3-2x | | 10h-3(2h-9)=9(h-1)+1 | | -26+6x=-7x | | 10=-5n-10 | | 0.5x+12=3.5x | | 5x+20=10x+2 | | -27+3x=-6x | | 5v^2-26v+24=0 | | 114-4x=3x+23 | | 9(x+9)+x=2(x+5)-2 | | 4(x+10)+x=3(x+2) | | -7x-6=8 |

Equations solver categories