Harvard University Admission Interview Trick Y•Y•Y-Y•Y=100 | You Should Know This Trick

[@seyupo]

Since you guessed one root y=5 then divide the polynomial (yyy -yy-100)/(y-5) = yy+4y+20 and solve the quadratic equation for the other two roots. Will save you 10 minutes out of 11:47.

[@МишаЖиленко-у6б]

Its the simplest explanation i've seen on KZbin! Thank you very much!!

[@myasu1371]

感覚的に5と解る。