(w-7)(w+9)=0

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Solution for (w-7)(w+9)=0 equation: 


Simplifying
(w + -7)(w + 9) = 0

Reorder the terms:
(-7 + w)(w + 9) = 0

Reorder the terms:
(-7 + w)(9 + w) = 0

Multiply (-7 + w) * (9 + w)
(-7(9 + w) + w(9 + w)) = 0
((9 * -7 + w * -7) + w(9 + w)) = 0
((-63 + -7w) + w(9 + w)) = 0
(-63 + -7w + (9 * w + w * w)) = 0
(-63 + -7w + (9w + w2)) = 0

Combine like terms: -7w + 9w = 2w
(-63 + 2w + w2) = 0

Solving
-63 + 2w + w2 = 0

Solving for variable 'w'.

Factor a trinomial.
(-9 + -1w)(7 + -1w) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(7 + -1w)' equal to zero and attempt to solve:

Simplifying
7 + -1w = 0

Solving
7 + -1w = 0

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

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

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

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

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

Simplifying
w = 7
Solution
w = {-9, 7}

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