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

asked Mar 4, 2015 177k views

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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

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$y=-x^2+2x-1=-(x^2-2x+1)=-(x-1)^2\ \ \Rightarrow\ \ y \leq 0\\ \\C.\ x=2\ \ \Rightarrow\ \ \ y=-(2-1)^2=-1\ \ \Rightarrow\ \ (2;-1)\\ \\Ans.\ C$

AlejandroR answered Mar 8, 2015

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