Question

use suitable identity (2y+5) (2y+5)​

Answer 1

(a+b)(a+b)=(a+b)²

is suitable identity of this sum

(a+b)² =a²+b²+2ab

=(2y)²+(5)²+2×2y×5

=4y²+25+20y

=4y²+20y+25. is your answer

Answer 2

Answer: $4y^{2}+25+20y$

Step-by-step explanation:

(2y+5) (2y+5)​

=$(2y+5)^{2}$

=$(2y)^{2} +5^{2} +2*2y*5$

=$4y^{2}+25+20y$

$(A+B)^{2} =A^{2} +B^{2} +2AB$