What is the number which is to be added with 49x square + 4y square to get a perfect square

The number which should be added  with 49x square + 4y square to get a perfect square is 28xy

Step-by-step explanation:

We need to find the number which is to be added with 49x square + 4y square to get a perfect square.

The expression given is:

For the expression to be perfect square it should be of form:

Now, we are given and we need to find the middle term

So, solving:

The number which should be added  with 49x square + 4y square () to get a perfect square is 28xy

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3