Question

find the square of (2y+3)^2 using identities​

Answer 1

$(x + y) ^{2} = x ^{2} + 2xy + y ^{2}$

$(2y + 3) ^{2} = (2y) ^{2} + 2 \times 2y \times 3 + 3 ^{2} = 4y ^{2} + 12y + 9$