Question

Simplify : (2y+5)2 – (2y-5)2​

Answer 1

( 2y + 5 ) 2 - ( 2y - 5 ) 2

4y + 10 - ( 2y - 5 ) × 2

4y + 10 - ( 4y - 10 )

4y + 10 - 4y - ( - 10 )

4y + 10 - 4y + 10

10 + 10

20

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Answer 2

(2y+5)² – (2y-5)²

[(2y)²+5²+2(2y)(5)] - [(2y)²+(5)²-2(2y)(5)]

20y+20y

40y