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

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


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

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

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

Multiply (-7 + n) * (9 + n)
(-7(9 + n) + n(9 + n)) = 0
((9 * -7 + n * -7) + n(9 + n)) = 0
((-63 + -7n) + n(9 + n)) = 0
(-63 + -7n + (9 * n + n * n)) = 0
(-63 + -7n + (9n + n2)) = 0

Combine like terms: -7n + 9n = 2n
(-63 + 2n + n2) = 0

Solving
-63 + 2n + n2 = 0

Solving for variable 'n'.

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

Subproblem 1

Set the factor '(-9 + -1n)' equal to zero and attempt to solve: Simplifying -9 + -1n = 0 Solving -9 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1n = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1n = 0 + 9 -1n = 0 + 9 Combine like terms: 0 + 9 = 9 -1n = 9 Divide each side by '-1'. n = -9 Simplifying n = -9

Subproblem 2

Set the factor '(7 + -1n)' equal to zero and attempt to solve: Simplifying 7 + -1n = 0 Solving 7 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1n = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1n = 0 + -7 -1n = 0 + -7 Combine like terms: 0 + -7 = -7 -1n = -7 Divide each side by '-1'. n = 7 Simplifying n = 7

Solution

n = {-9, 7}

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