kaceykoedel kaceykoedel

06-05-2014
Mathematics

Answered

What are the x-intercepts of the quadratic function?
y = –x2 + 2x – 1
(Points : 1) A. 2 and 1 B. –2 and 1 C. 2 and –1 D. 1

Answer :

kate200468 kate200468

06-05-2014

[tex]y=-x^2+2x-1=-(x^2-2x+1)=-(x-1)^2\ \ \Rightarrow\ \ y \leq 0\\ \\C.\ x=2\ \ \Rightarrow\ \ \ y=-(2-1)^2=-1\ \ \Rightarrow\ \ (2;-1)\\ \\Ans.\ C[/tex]

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