Can someone help please

a=4

Step-by-step explanation:

Hi there!

We are looking for the value of . We know that and .

We'll start with the Pythagorean theorem:

Now, we'll subtract from both sides so that is by itself.

We can now substitute our known values of and into the equation. Make sure to put the substituted values in parenthesis.

Let's apply the exponents to the values we substituted in:

Now, to eliminate the exponent on , we take the square root of both sides:

Let me know if you have any questions!

im sorry but no. i just need to answer for 50 poonts oof