7k^2+8k=-1

Solution for 7k^2+8k=-1 equation:

Simplifying
7k2 + 8k = -1

Reorder the terms:
8k + 7k2 = -1

Solving
8k + 7k2 = -1

Solving for variable 'k'.

Reorder the terms:
1 + 8k + 7k2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 8k + 7k2 = 0

Factor a trinomial.
(1 + k)(1 + 7k) = 0

Subproblem 1
Set the factor '(1 + k)' equal to zero and attempt to solve:

Simplifying
1 + k = 0

Solving
1 + k = 0

Move all terms containing k to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + k = 0 + -1

Combine like terms: 1 + -1 = 0
0 + k = 0 + -1
k = 0 + -1

Combine like terms: 0 + -1 = -1
k = -1

Simplifying
k = -1
Subproblem 2
Set the factor '(1 + 7k)' equal to zero and attempt to solve:

Simplifying
1 + 7k = 0

Solving
1 + 7k = 0

Move all terms containing k to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 7k = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 7k = 0 + -1
7k = 0 + -1

Combine like terms: 0 + -1 = -1
7k = -1

Divide each side by '7'.
k = -0.1428571429

Simplifying
k = -0.1428571429
Solution
k = {-1, -0.1428571429}