(x-1)(x)=15

Simple and best practice solution for (x-1)(x)=15 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-1)(x)=15 equation:


Simplifying
(x + -1)(x) = 15

Reorder the terms:
(-1 + x)(x) = 15

Reorder the terms for easier multiplication:
x(-1 + x) = 15
(-1 * x + x * x) = 15
(-1x + x2) = 15

Solving
-1x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -1x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -1x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -1x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -1x + x2 = 0 + 15
-1x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-1x + x2 = 15

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 = 15 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 15 + 0.25

Combine like terms: 15 + 0.25 = 15.25
0.25 + -1x + x2 = 15.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(x + -0.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

x + -0.5 = 3.905124838 Simplifying x + -0.5 = 3.905124838 Reorder the terms: -0.5 + x = 3.905124838 Solving -0.5 + x = 3.905124838 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 = 3.905124838 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 3.905124838 + 0.5 x = 3.905124838 + 0.5 Combine like terms: 3.905124838 + 0.5 = 4.405124838 x = 4.405124838 Simplifying x = 4.405124838

Subproblem 2

x + -0.5 = -3.905124838 Simplifying x + -0.5 = -3.905124838 Reorder the terms: -0.5 + x = -3.905124838 Solving -0.5 + x = -3.905124838 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 = -3.905124838 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -3.905124838 + 0.5 x = -3.905124838 + 0.5 Combine like terms: -3.905124838 + 0.5 = -3.405124838 x = -3.405124838 Simplifying x = -3.405124838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.405124838, -3.405124838}

See similar equations:

| 12y-3x+5=5-3y | | p-p+6p=12 | | 2(x-3)=3(x+6)+6 | | 9z=6(.5z-6) | | 7x+33=67 | | r+2r-r-2r+r=4 | | (9x^4)^-1/2= | | 9.5k+1-8.5k=8 | | 7-(8x+5)=5[(2x-5)-(x-1)] | | 6+2a=24 | | f(x)=-12+3x | | -14y+-2y=-16 | | c=2pi(10) | | 12x-10x-2x+2x=14 | | c=2pi(9) | | (34-12)/12 | | 48=118-x | | 2(3k-1)-4(2k+2)=3-3(k+2) | | 4x^2-36x-6=2x^2-1x | | 29=4x-9 | | 1.9=3.8+x | | f(x)=-10+5x | | 15x+63=-12 | | v+0.333=-0.40 | | 37=6x-5 | | x+10-5x+6=-15 | | 14x+44=-12 | | 7+x(x)=221 | | h(0)=-16t^2+80t | | -3/5/-4/7 | | -5x-2=5x+25 | | 2x-3.2=1.7 |

Equations solver categories