If a,b,c are integers and b²=4(ac+5d²), d €N then roots of the eqn ax²+bx+c=0 are

Answer 1

Looking back I see many posts by you involving the quadratic equation and its properties,

You have shown no sign that you have attempted any of them, nor did you indicate where your problems lie.
The intent of this forum is not to simply do homework or assignments for you.

for this one, here is a clue:
you are given:
b^2 = 4(ac + 5d^2)
or
b^2 - 4ac = 20d^2

doesn't b^2 - 4ac show up in the quadratic formula?
See if you can somehow work that in ....

Answer 2

A businessman paid 25,000.00 for 12 machines.Find the
1 coast of 10 machine of the same type
2 number of such machines 175,000.00 can buy