HP50g or other: U. of Houston calc exams

[Didier Lachieze]

(08-10-2015 02:12 PM)Hlib Wrote:  Prime users aren't engaged in this little things. They go to sleep and don't know, whether their calculator will work tomorrow.

My Prime has been working every day I needed it, so I don't fear tomorrow

For the first problem (sum of factors of 224551579230):

Code:

CAS.ifactors(224551579230)▶L1
ΣLIST(MAKELIST(L1(I)*L1(I+1),I,1,SIZE(L1),2))

returns 301

And for the second problem (2015 .19), in CAS mode:

Code:

solve({2x-3y=6-7a,-3x+5y=7+2a,7x+11y=4-6a},[a,x,y])

returns a=235/128



and with a^2 in the first equation :

Code:

 solve({2x-3y=6-7a^2,-3x+5y=7+2a,7x+11y=4-6a},[a,x,y])

returns for a: (-2*√21106+23)/238 & (2*√21106+23)/238