How do you factorise: 16-25(a+3)(a+3) (5x-y)(5x-y)-(y-3x)(y-3x)

3 Answers

oldnick's profile pic

oldnick | (Level 1) Valedictorian

Posted on


`=[(5x-y)+(y-3x)][5x-y)-(y-3x)]= `




pramodpandey's profile pic

pramodpandey | College Teacher | (Level 3) Valedictorian

Posted on


16-25(a+3)(a+3)     (i)

since we can write

16=4 x 4

25= 5 x 5

Also we know


therefore given question reduces to



`=4^2-(5a+15)^2`  ,

let x=4 and y=5a+15












`=4x(4x-y) `