(w-9)*(w+4)=

Solution for (w-9)*(w+4)= equation:

Simplifying
(w + -9)(w + 4) = 0

Reorder the terms:
(-9 + w)(w + 4) = 0

Reorder the terms:
(-9 + w)(4 + w) = 0

Multiply (-9 + w) * (4 + w)
(-9(4 + w) + w(4 + w)) = 0
((4 * -9 + w * -9) + w(4 + w)) = 0
((-36 + -9w) + w(4 + w)) = 0
(-36 + -9w + (4 * w + w * w)) = 0
(-36 + -9w + (4w + w2)) = 0

Combine like terms: -9w + 4w = -5w
(-36 + -5w + w2) = 0

Solving
-36 + -5w + w2 = 0

Solving for variable 'w'.

Factor a trinomial.
(-4 + -1w)(9 + -1w) = 0

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

Simplifying
-4 + -1w = 0

Solving
-4 + -1w = 0

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

Add '4' to each side of the equation.
-4 + 4 + -1w = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1w = 0 + 4
-1w = 0 + 4

Combine like terms: 0 + 4 = 4
-1w = 4

Divide each side by '-1'.
w = -4

Simplifying
w = -4
Subproblem 2
Set the factor '(9 + -1w)' equal to zero and attempt to solve:

Simplifying
9 + -1w = 0

Solving
9 + -1w = 0

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

Add '-9' to each side of the equation.
9 + -9 + -1w = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1w = 0 + -9
-1w = 0 + -9

Combine like terms: 0 + -9 = -9
-1w = -9

Divide each side by '-1'.
w = 9

Simplifying
w = 9
Solution
w = {-4, 9}