Question

factorise (a-4b)(a+4b)(a2+16b2)​

Answer 1

Answer:

$( 3a + \frac{1}{4} b {}^{2} )$

Step-by-step explanation:

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Answer 2

Answer:

${a}^{4} - 256 {b}^{4}$

Step-by-step explanation:

$(a - 4b)(a + 4b)( {a}^{2} + 16 {b}^{2}) \\ =( ({a}^{2} ) - {(4b)}^{2})( {a}^{2} + {16b}^{2} )\\= ({a}^{2} - {16b}^{2} )( {a}^{2} + 16 b^{2} ) \\ = ( { {a}^{2} )}^{2} - ( { {16b}^{2}) }^{2} = {a}^{4} - 256 {b}^{4}$