convert string and sym equstion to use maple symbolic engine !

hi everyone, i have an equation, a*x^2+1 . i want to solve this using maple symbolic engine. i use following , but it ended up with error :

i think the problem is about the string ' ' which i should put equations into to be solved ! how can i convert this string to a normal symbolic equation ? how can i convert 'a*x^2-1' to 10*x^2-1 , to solve the problem ? tnx for help.

Answer 1

[Birdman]

syms a x
eq=a*x^2-1
%%symbolic substitution for a in eq
eq1=subs(eq,a,10)
solve(eq1,x)