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OpenStudy (anonymous):
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
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hartnn (hartnn):
divide the co-efficient of x by 2 what u get ?
OpenStudy (anonymous):
-5/2 ?
hartnn (hartnn):
yup, now square it, what u get ?
OpenStudy (anonymous):
i got -1.25
hartnn (hartnn):
square of a number can never be negative...
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hartnn (hartnn):
(-5/2)^2 = 25/4
OpenStudy (anonymous):
oh I see, thank u very much
hartnn (hartnn):
so, c= 25/4 ok, welcome ^_^
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