d^2-9d-70=0

Solution for d^2-9d-70=0 equation:

Simplifying
d2 + -9d + -70 = 0

Reorder the terms:
-70 + -9d + d2 = 0

Solving
-70 + -9d + d2 = 0

Solving for variable 'd'.

Factor a trinomial.
(-5 + -1d)(14 + -1d) = 0

Subproblem 1
Set the factor '(-5 + -1d)' equal to zero and attempt to solve:

Simplifying
-5 + -1d = 0

Solving
-5 + -1d = 0

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

Add '5' to each side of the equation.
-5 + 5 + -1d = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1d = 0 + 5
-1d = 0 + 5

Combine like terms: 0 + 5 = 5
-1d = 5

Divide each side by '-1'.
d = -5

Simplifying
d = -5
Subproblem 2
Set the factor '(14 + -1d)' equal to zero and attempt to solve:

Simplifying
14 + -1d = 0

Solving
14 + -1d = 0

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

Add '-14' to each side of the equation.
14 + -14 + -1d = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -1d = 0 + -14
-1d = 0 + -14

Combine like terms: 0 + -14 = -14
-1d = -14

Divide each side by '-1'.
d = 14

Simplifying
d = 14
Solution
d = {-5, 14}