Question

Which value of c makes the expression x^2-5x+c a perfect square trinomial?
a)-5/2
b)5/2
c)25/4
d)25

Answer 1

divide the co-efficient of x by 2
what u get ?

Answer 2

-5/2 ?

Answer 3

yup,
now square it, what u get ?

Answer 4

i got -1.25

Answer 5

square of a number can never be negative...

Answer 6

(-5/2)^2 = 25/4

Answer 7

oh I see, thank u very much

Answer 8

so, c= 25/4
ok, welcome ^_^