Step-by-step explanation:

Consider the given expression,

(36x

2

+25y

2

+60xy) at x=

5

1

andy=

3

4

⇒36(

5

1

)

2

+25(

3

4

)

2

+60×(

5

1

×

3

4

)

⇒36(

25

1

)+25(

9

16

)+60×(

15

4

)

⇒

25

36

+

9

400

+16

⇒

225

13924

Hence, the value of the expression is

225

13924