Answer:

(5x + 2y²) = ​25x² + 20xy + 4y²​

Explaination: Para matuto ka na din, hindi lang puro sagot

(5x + 2y) (5x + 2y)

Use the FOIL METHOD:

First- (5x) (5x)=25x²

Out- (5x) (2y) =10xy

In-    (2y) (5x) =10xy

Last-(2y) (2y) =4y²

(25x²+10xy+10xy+4y²)

Add the like/similar terms:

10xy + 10xy= 20xy

Final Answer: 25x² + 20xy + 4y²​

Missing term of your answer: 25x²