h^2+4h-21=0

Solution for h^2+4h-21=0 equation:

Simplifying
h2 + 4h + -21 = 0

Reorder the terms:
-21 + 4h + h2 = 0

Solving
-21 + 4h + h2 = 0

Solving for variable 'h'.

Factor a trinomial.
(-7 + -1h)(3 + -1h) = 0

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

Simplifying
-7 + -1h = 0

Solving
-7 + -1h = 0

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

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

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

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

Divide each side by '-1'.
h = -7

Simplifying
h = -7
Subproblem 2
Set the factor '(3 + -1h)' equal to zero and attempt to solve:

Simplifying
3 + -1h = 0

Solving
3 + -1h = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1h = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1h = 0 + -3
-1h = 0 + -3

Combine like terms: 0 + -3 = -3
-1h = -3

Divide each side by '-1'.
h = 3

Simplifying
h = 3
Solution
h = {-7, 3}