Factorize the expressions completely.
1. 1-25a⁴.
2. X²-9x+8.
3. X²-9.
4. X²+8x+15.
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1 - 25a⁴ can be written as 25a⁴ - 1 also.
so,
⇒ 25a⁴ - 1 = 0
⇒ 25a⁴ = 1
⇒ a⁴ = (1/25)
⇒ a = ∜(1/25)
⇒ x² - 9 = 0
⇒ x² = 9
⇒ x = √9
⇒ x = ±3
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