-q^2-8q+1=0

Simple and best practice solution for -q^2-8q+1=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 -q^2-8q+1=0 equation:


Simplifying
-1q2 + -8q + 1 = 0

Reorder the terms:
1 + -8q + -1q2 = 0

Solving
1 + -8q + -1q2 = 0

Solving for variable 'q'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + 8q + q2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 8q + 1 + q2 = 0 + 1

Reorder the terms:
-1 + 1 + 8q + q2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 8q + q2 = 0 + 1
8q + q2 = 0 + 1

Combine like terms: 0 + 1 = 1
8q + q2 = 1

The q term is 8q.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8q + 16 + q2 = 1 + 16

Reorder the terms:
16 + 8q + q2 = 1 + 16

Combine like terms: 1 + 16 = 17
16 + 8q + q2 = 17

Factor a perfect square on the left side:
(q + 4)(q + 4) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(q + 4) equal to 4.123105626 and -4.123105626.

Subproblem 1

q + 4 = 4.123105626 Simplifying q + 4 = 4.123105626 Reorder the terms: 4 + q = 4.123105626 Solving 4 + q = 4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + q = 4.123105626 + -4 Combine like terms: 4 + -4 = 0 0 + q = 4.123105626 + -4 q = 4.123105626 + -4 Combine like terms: 4.123105626 + -4 = 0.123105626 q = 0.123105626 Simplifying q = 0.123105626

Subproblem 2

q + 4 = -4.123105626 Simplifying q + 4 = -4.123105626 Reorder the terms: 4 + q = -4.123105626 Solving 4 + q = -4.123105626 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + q = -4.123105626 + -4 Combine like terms: 4 + -4 = 0 0 + q = -4.123105626 + -4 q = -4.123105626 + -4 Combine like terms: -4.123105626 + -4 = -8.123105626 q = -8.123105626 Simplifying q = -8.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. q = {0.123105626, -8.123105626}

See similar equations:

| 5rx-30=0 | | (4a-3)(a-2)= | | 9j-2=9j^2 | | w^3=-17 | | 22+2k=37+6-k | | -5x-2=3x+12 | | 705x-21000+70x+x^2=0 | | 8n-11=5 | | 2+n+7-9n= | | 4m^2-9m+4=0 | | 4x-2(6+2x)=-12 | | 2(3x+4x)=70 | | 9n^2=4n+9 | | -3x-4=x+5 | | D-3/4=J-9 | | (-2/7)*3*(-5/-9) | | 2x+3y+6z=12 | | 1/x-10/3x=1/9 | | 1a^2+3a-10=0 | | x-3=4(x-9) | | =4i+(-3i+12j) | | a-10b-c+3-a+9b-c= | | x-.75+6=x-3 | | 92-7x=29x+24 | | y^2+12y+35/4y^2+36y+56 | | -3x-40=4(1+2x) | | 0=440x-16000-x^2 | | -8t^2+2=-6t | | 14-8x=60-22x | | (-1/4w+24)+1=(1/w+6) | | 22+2k=37+6+k | | X+8/5(X)=130 |

Equations solver categories