Question

Factorise the following expressions.
( 1 ) p2 - p2
( 2 ) y2 - 4
( 3 ) 4x2 - 25y2
$(1) {a}^{2} - {4}^{2} = {a}^{2} - {(2b)}^{2} \\ = (a + 2b)(a + 2b)$
$(2) {3a}^{2} - {27b}^{2} = 3( {a}^{2} - {9b}^{2} \\ = 3(a + 3b)(a + 3b)$

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Answer 1

Answer:

I think that 3 is wrong expression please check it n tell me is it wrong or right?????