Question

How can you tell when a quadratic equation has two identical, rational solutions?

when the radicand is negative

when b in the quadratic formula is greater than the radicand

when the radicand equals zero

when the radicand is not a perfect square

Answer 1

when radicand = zero

Answer 2

i assume that radicand = b^2-4ac ??

Answer 3

in uk we call it the discriminant

Answer 4

when the radicand equals zero

for ax^2+bx+c=0
find b^2-4ac
if that is = 0 ------> the equation has 2 identical roots

Answer 5

it is called discriminant in the US also.

In general, the radicand is the expression under a radical sign.