Answer:
1.
square root of 361 is 19
x^2-19^2=0
(x+19)(x-19)
No.2 is subtract 784 on both sides and same as no.1
3.
subtract 900 on both sides and end up with x^2=0
4.
subtract 29 on both sides and use quadratic formula
same for 5 and 6
for 7,8,9,10
solve the square bracket first and solve with quadratic formula