(w-4)(w+5)=

Solution for (w-4)(w+5)= equation:

Simplifying
(w + -4)(w + 5) = 0

Reorder the terms:
(-4 + w)(w + 5) = 0

Reorder the terms:
(-4 + w)(5 + w) = 0

Multiply (-4 + w) * (5 + w)
(-4(5 + w) + w(5 + w)) = 0
((5 * -4 + w * -4) + w(5 + w)) = 0
((-20 + -4w) + w(5 + w)) = 0
(-20 + -4w + (5 * w + w * w)) = 0
(-20 + -4w + (5w + w2)) = 0

Combine like terms: -4w + 5w = 1w
(-20 + 1w + w2) = 0

Solving
-20 + 1w + w2 = 0

Solving for variable 'w'.

Factor a trinomial.
(-5 + -1w)(4 + -1w) = 0

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

Simplifying
-5 + -1w = 0

Solving
-5 + -1w = 0

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

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

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

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

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

Simplifying
w = -5
Subproblem 2
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
Solution
w = {-5, 4}