x^2-x-17=0

Simple and best practice solution for x^2-x-17=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 x^2-x-17=0 equation:


Simplifying
x2 + -1x + -17 = 0

Reorder the terms:
-17 + -1x + x2 = 0

Solving
-17 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -1x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + -1x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -1x + x2 = 0 + 17
-1x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
-1x + x2 = 17

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 = 17 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 17 + 0.25

Combine like terms: 17 + 0.25 = 17.25
0.25 + -1x + x2 = 17.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + -0.5 = 4.153311931 Simplifying x + -0.5 = 4.153311931 Reorder the terms: -0.5 + x = 4.153311931 Solving -0.5 + x = 4.153311931 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 = 4.153311931 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 4.153311931 + 0.5 x = 4.153311931 + 0.5 Combine like terms: 4.153311931 + 0.5 = 4.653311931 x = 4.653311931 Simplifying x = 4.653311931

Subproblem 2

x + -0.5 = -4.153311931 Simplifying x + -0.5 = -4.153311931 Reorder the terms: -0.5 + x = -4.153311931 Solving -0.5 + x = -4.153311931 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 = -4.153311931 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -4.153311931 + 0.5 x = -4.153311931 + 0.5 Combine like terms: -4.153311931 + 0.5 = -3.653311931 x = -3.653311931 Simplifying x = -3.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.653311931, -3.653311931}

See similar equations:

| 4(3+4x)-3=73 | | 10.1/10=10 | | 16a^2-a^6c^4= | | 2s-20=-11+s | | 4(xy)=(4x)y | | 8+(8)= | | a=l*w | | 2x+5=56 | | 89-2x=25x+17 | | 9n-15=84 | | 7n-28=21 | | 50-(3x)=8 | | 31-2x=7x+18 | | 10-9x=158-32x | | 126-6x=4x+6 | | 94-2x=10x-22 | | 74-3x=2x+19 | | 58-3x=8 | | 2n+5=90 | | -4x-10x=-12 | | 2x^2-7x+30=0 | | (7x+3)*9=-40 | | 49-4x=5x+23 | | -3/16=x-7/12 | | 2x+56=6+12 | | 2x+5y-1=0 | | 5p+5q=65 | | 4.7=0.1x+2.6+0.9 | | -20+x-7=5x-3 | | 4(12)(16)=x | | 4x=12(16) | | 4=12(16)x |

Equations solver categories