Question

factorise using appropriate identities
$( {y}^{2} + 25)( {y}^{2} - 25)$

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Answer 1

Question :

$\sf \small ( {y}^{2} + 25)( {y}^{2} - 25)$

$\sf \small ( {y}^{2} + 25)( {y}^{2} - 25)$

Formula Used :

$\sf \small(a + b)(a - b) = {a}^{2} - {b}^{2}$

Solution :

$\sf \small ({y}^{2} + 25)( {y}^{2} - 25)$

$\sf \small( {y}^{2} + 25)( {y}- 5)(y + 5)$

Hence the solution is : (y² + 25)(y – 5)(y + 5)