A=0 is correct.
What makes you think it is wrong?
The initial question was :
y''-10y'+61y=0
i've got the general solution which is e^5x(A cos(6x)+b sin(6x))
given that the initial conditions were y(0)=0 and y'(0)=-9,find A and B
after i calculated shudn't A =0?it seems i was wrong?
Please help thanks!