Show that the expression for all values of y are real numbers . I tried expanding the whole thing .. but no idea how to show it .. Wonder what i can from here ..
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if you plot the expanded function on a graph and show that it is always less than zero then that should work. is this any help??
Originally Posted by hmmmm if you plot the expanded function on a graph and show that it is always less than zero then that should work. is this any help?? THanks for your reply but besides plotting it on a graph to show , is that any other method such as showing it in the equation itself ?
not that i can see apart from differentiating to show maximum value that is less than 257 sorry
Last edited by hmmmm; Jan 11th 2009 at 08:48 AM.
Originally Posted by mathaddict Show that the expression for all values of y are real numbers . What you want to show is that You can actually show that or Factoring the RHS gives which is clearly true which makes (1) true.
Thanks Danny . By the way , how did you factorise to .
Originally Posted by mathaddict Thanks Danny . By the way , how did you factorise to . When I looked at the factors I saw and grouping them in pairs I saw a difference of 2 in y then If we let then so giving . Hope it helps.
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