Question 378041
Assuming a is not equal to zero, then -b/a = 17 and c/a = 42.  Then b = -17a, and c = 42a.  THEN {{{ax^2+bx+c= ax^2 -17ax + 42a = 0}}}, or {{{x^2 - 17x + 42 = 0}}} after dividing both sides by a.