(n+3)(2n+3)=n^2+4+n^2-4

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Solution for (n+3)(2n+3)=n^2+4+n^2-4 equation:


Simplifying
(n + 3)(2n + 3) = n2 + 4 + n2 + -4

Reorder the terms:
(3 + n)(2n + 3) = n2 + 4 + n2 + -4

Reorder the terms:
(3 + n)(3 + 2n) = n2 + 4 + n2 + -4

Multiply (3 + n) * (3 + 2n)
(3(3 + 2n) + n(3 + 2n)) = n2 + 4 + n2 + -4
((3 * 3 + 2n * 3) + n(3 + 2n)) = n2 + 4 + n2 + -4
((9 + 6n) + n(3 + 2n)) = n2 + 4 + n2 + -4
(9 + 6n + (3 * n + 2n * n)) = n2 + 4 + n2 + -4
(9 + 6n + (3n + 2n2)) = n2 + 4 + n2 + -4

Combine like terms: 6n + 3n = 9n
(9 + 9n + 2n2) = n2 + 4 + n2 + -4

Reorder the terms:
9 + 9n + 2n2 = 4 + -4 + n2 + n2

Combine like terms: 4 + -4 = 0
9 + 9n + 2n2 = 0 + n2 + n2
9 + 9n + 2n2 = n2 + n2

Combine like terms: n2 + n2 = 2n2
9 + 9n + 2n2 = 2n2

Add '-2n2' to each side of the equation.
9 + 9n + 2n2 + -2n2 = 2n2 + -2n2

Combine like terms: 2n2 + -2n2 = 0
9 + 9n + 0 = 2n2 + -2n2
9 + 9n = 2n2 + -2n2

Combine like terms: 2n2 + -2n2 = 0
9 + 9n = 0

Solving
9 + 9n = 0

Solving for variable 'n'.

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

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

Combine like terms: 9 + -9 = 0
0 + 9n = 0 + -9
9n = 0 + -9

Combine like terms: 0 + -9 = -9
9n = -9

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

Simplifying
n = -1

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