(2) $$ 20-5 y^{2} $$ (5) $$ 2 x-18 x^{3} $$ (8) $$ 3 a^{7} b-27 a b^{3} $$

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Factor the expression by following steps:
- step0: Factor:
  $$2x-18x^{3}$$
- step1: Factor the expression:
  $$2x\left(1-9x^{2}\right)$$
- step2: Factor the expression:
  $$2x\left(1-3x\right)\left(1+3x\right)$$
Factor the expression $$ 20-5 y^{2} $$.
Factor the expression by following steps:
- step0: Factor:
  $$20-5y^{2}$$
- step1: Factor the expression:
  $$5\left(4-y^{2}\right)$$
- step2: Factor the expression:
  $$5\left(2-y\right)\left(2+y\right)$$
Factor the expression $$ 3 a^{7} b-27 a b^{3} $$.
Factor the expression by following steps:
- step0: Factor:
  $$3a^{7}b-27ab^{3}$$
- step1: Factor the expression:
  $$3ab\left(a^{6}-9b^{2}\right)$$
- step2: Factor the expression:
  $$3ab\left(a^{3}-3b\right)\left(a^{3}+3b\right)$$
Here are the factored forms of the given expressions:

1. For the expression $$ 20 - 5y^{2} $$:
   - The factored form is $$ 5(2 - y)(2 + y) $$.

2. For the expression $$ 2x - 18x^{3} $$:
   - The factored form is $$ 2x(1 - 3x)(1 + 3x) $$.

3. For the expression $$ 3a^{7}b - 27ab^{3} $$:
   - The factored form is $$ 3ab(a^{3} - 3b)(a^{3} + 3b) $$.

If you have any further questions or need additional assistance, feel free to ask!
The factored forms are: 1. $$ 5(2 - y)(2 + y) $$ 2. $$ 2x(1 - 3x)(1 + 3x) $$ 3. $$ 3ab(a^{3} - 3b)(a^{3} + 3b) $$

(2) \( 20-5 y^{2} \) (5) \( 2 x-18 x^{3} \) (8) \( 3 a^{7} b-27 a b^{3} \)

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