神機．新手

1.If f(x)=x^2-2x-5, find the value of k such that f(k+1)=k.

2.A wire of 24m long is cut into two parts .Then they are bent to form two squares.
(a) Express the total area A of the squares formed in terms of x.

(b) Find the minimum value of A

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神機．新手

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神機．新手

1.              f(k+1)=k
     (k+1)^2-2(k+1)-5=k
                 k^2-k-6=0
               (k-3)(k+2)=0
               k=3ork= -2
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