7r^2-10r-8=

Solution for 7r^2-10r-8= equation:

Simplifying
7r2 + -10r + -8 = 0

Reorder the terms:
-8 + -10r + 7r2 = 0

Solving
-8 + -10r + 7r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-4 + -7r)(2 + -1r) = 0

Subproblem 1
Set the factor '(-4 + -7r)' equal to zero and attempt to solve:

Simplifying
-4 + -7r = 0

Solving
-4 + -7r = 0

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

Add '4' to each side of the equation.
-4 + 4 + -7r = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -7r = 0 + 4
-7r = 0 + 4

Combine like terms: 0 + 4 = 4
-7r = 4

Divide each side by '-7'.
r = -0.5714285714

Simplifying
r = -0.5714285714
Subproblem 2
Set the factor '(2 + -1r)' equal to zero and attempt to solve:

Simplifying
2 + -1r = 0

Solving
2 + -1r = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1r = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1r = 0 + -2
-1r = 0 + -2

Combine like terms: 0 + -2 = -2
-1r = -2

Divide each side by '-1'.
r = 2

Simplifying
r = 2
Solution
r = {-0.5714285714, 2}