Question

Q4 . Simplify : (x+y)² - (x-y)²

Q5 . Write coefficient of x in the expansion of (2x + 3)²
.

-------------PLEASE HELP------------​

Answer 1

solve question 1 by identity a²-b²= (a+b) (a-b)

==> (x+y) +(x-y) × (x+y) -(x-y)

==> x+y+x-y × x+y-x+y

==> (2x) (2y)

==> 4xy

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