How do I solve this projectile motion problem?

Problem Statement:

A gun is fired from point A hitting the target at point B. The initial velocity is 400 m/s.

Determine the two angles of elevation at which the bullet will hit the target B.

If possible, try to use SOLVE( ), SUB( ), SYMS( ), DIFF ( ). Thanks!

[madhan ravi]

ok ? what did you do?

[Image Analyst]

Here's help Click here

[cody madsen]

[madhan ravi]

picture won't help upload the code