Question

Factorise a) 25a^3 – 49a

Answer 1

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$25 {a}^{3} - 49a$

$= a(25 {a}^{2} - 49)$

$= a \{ \: {(5a)}^{2} - {7}^{2} \}$

$= a(5a + 7)(5a - 7) \: \: \:( using \: the \: identity \: {x}^{2} - {y}^{2} = (x + y)(x - y)$

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Answer 2

Answer:

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