Maths Prelim Question (1 Viewer)

[Varin9]

Hi, can someone please post the working out for this question, because for some reason myne is like 3 pages long lol, x^2 - 5x + a, find the value of a

 

[deterministic]

um question makes no sense

 

[Varin9]

回复: Re: Maths Prelim Question

well it says, a has exactly one root, its a quad ratic

 

[deterministic]

Using the completing the square method
a=(-5/2)^2=25/4

 

[Bored Of Fail 2]

Using the completing the square method
a=(-5/2)^2=25/4

you really should use the determinate method ( as it is more likely a prelim student will understand your soln )

so for exactly one root the determinate must equal zero

and there determinate= b^2 -4ac = (-5)^2 -4 ( 1)(a) = 25 -4a

we set equal to zero and get a= 25/4

 

[deterministic]

"discrimminant" not "determinants" - too much first year maths haha