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(2,0) (-4,0) (0,8) Find the quadratic function of analytic style

jianluyu102010-02-04 09:01:27 +0000 #1
how operators can bring out the next course of abc I do not understand the Thank you,
abababccccc2010-02-04 09:06:14 +0000 #2
set y = ax squared + bx + c

substitution

4a +2 b + c = 0

16a-4b + c = 0

c = 8

then 4a +2 b =- 8 8a +4 b =- 16

16a-4b =- 8

24a =- 24 Therefore, a =- 1

substituted into the why b =- 2

So a =- 1

b =- 2

c = 8

So, y =- x squared-2x +8

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