Question

factorise 16y4 ‐ 81
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Answer 1

Step-by-step explanation:

Rewrite 81 as 92 . Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) a 2 - b 2 = ( a + b ) ( a - b ) where a=4y2 a = 4 y 2 and b=9 . Simplify. Rewrite 4y2 4 y 2 as (2y)2 ( 2 y ) 2 .