Question

Which one are correct of the followings?
i. (2x+3y)(2x-3y)=4x^2-9y^2
ii. 1/2 {(m-n)^2+(m+n)^2} = m^2 + n^2
iii. (a+b)^2+4ab=(a-b)^2

Answer 1

Answer:

i. and ii. is correct

Step-by-step explanation:

i. (2x+3y)(2x-3y)=4x^2-9y^2

ii. 1/2 {(m-n)^2+(m+n)^2} = m^2 + n^2

iii. correct answer is (a+b)^2 - 4ab=(a-b)^2