Solve the equation by finding square roots. to start, remember to isolate x^2. equation= x^2+4=20

Get the equation simplified. Subtract 4 by each side.
20-4= 16
and the square root of 16, is 4. 
Plug it in to check. 
(4)^2+4=20
16+4=20
20=20

Ultimately your final answer is X=4

2+1=3 that’s your answer