Question

what should be added in 25x²+16y² to make it (5x+4y)²​

Answer 1

Answer:

25x²+16y²

(5x)² + (4y)²

5x+4y

Answer 2

Step-by-step explanation:

25x^2+16y^2+2×5x×4y=(5x+4y)^2

(5x+4y)^2=25x^2+16y^2+40xy

now,

25x^2+16y^2+40xy-25x^2-16y^2

=40xy