[a⁴/4 + 64/a⁶]

[a²/4 + 4/a²][a⁴/16 - 1 + 16/a⁴]

1

[4/a2]³

(5a - 3b)(5a + 3b)

(5a + 3b)3a

0

(3a + 3b)

(3a + b)(a - b)

(a - b)(3a + b + 3)

(b + 3)(a - b)

(a + b)³

2(2x - y)(2x + y)

2(2x - y)(2x + y)(4x² + y²)

4

2x

(x - 7)(x - 8)

(x + 7)(x - 8)

(x + 7)(x + 8)

(x - 8)

7p

(49p² - q²)

(q² - 49p²)

(7p - 9q)(7p + 9q)

(2c - 7d)(4c² + 14cd + 49d²)

(2c - 8c³)343d

(8c³ - 2c)(7d + 49)

343 - 8c

(10a - 15b)(10a + 15b)

(15a - 10b)

0

(10a + 10b) 15b

(x - y)(4 + 3x)

(x - y)(3x + y + 4)

(3x + y)4

(x - y)4

b(x + y)(2 - c)

c(x + y)(2 - b)

x(b + y)(2 - c)

None of these