Question

Can someone help me on this question and explain the process

Answer 1

Step-by-step explanation: Use Pythagorean Theorem

`a^2 + b^2 = c^2\\`

`15^2 + b^2 = 9^2\\`

`225 + b^2 = 81`

`- 255`
`-255`

-------------------

`b^2 = 174\\`

`b^2 = √(-174)`