Question

if a and b can take values 1 2 3 4 then the number of the equation of the form a x square + bx + 1 is equals to zero having real roots is

Answer 1

The answer would be option (b) 7

If it has real roots then b^2>=4ac.

a and b can only be 1,2,3,4.

If b=2, a can 1 and c can be 1 .......(Possibility 1)

If b=3, a can 2 and c can be 1 .......(Possibility 2)

If b=3, a can 1 and c can be 1 .......(Possibility 3)

If b=4, a can 2 and c can be 2 .......(Possibility 4)

If b=4, a can 3 and c can be 1 .......(Possibility 5)

If b=4, a can 1 and c can be 3 .......(Possibility 6)

If b=4, a can 1 and c can be 1 .......(Possibility 7)

Hope it helps.

Answer 2

Answer:

here is your solution

Step-by-step explanation:

above attachment