Factorise a4-16 is A- a -2 a -2 a 2-4B- a-112 a-12a2-12C- a2-2a-2a2-2D- a2-2a2-2a2-2

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(a ± b)²

Factorise a4-...

Question

Factorise $a^{4} - 16$ is ____

(a - 2) (a + 2) (a^{2} + 4)

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(a^{2} - 2) (a + 2) (a^{2} + 2)

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(a^{2} - 2) (a^{2} + 2) (a^{2} + 2)

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(a + 11) (2 a + 12) (a^{2} - 12)

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Factorise $2 a^{7} - 128 a$

{(a + \frac{1}{2 a +} \frac{1}{2 a +} \dots)}^{2} + {(a - \frac{1}{2 a -} \frac{1}{2 a -} \dots)}^{2} = 2 a^{2}

(a + \frac{1}{2 a +} \frac{1}{2 a +} \dots) (a - \frac{1}{2 a -} \frac{1}{2 a -} \dots) = a^{2} - \frac{1}{2 a^{2} -} \frac{1}{2 a^{2} -} \dots

\frac{a^{2} - 16}{a^{3} - 8} \times \frac{2 a^{2} - 3 a - 2}{2 a^{2} + 9 a + 4} \div \frac{3 a^{2} - 11 a - 4}{a^{2} + 2 a + 4}

If X = 1 - a^{2} and Y = 1 - b^{2}, then what is X^{2} + Y^{2} ?

a^{2} b (a^{3} - a + 1) - a b (a^{4} - 2 a^{2} + 2 a) - b (a^{3} - a^{2} - 1)

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