Asked by steve
Write a quadratic function rule for the following table
x -10 -5 0 5 10
y 80 5 -20 5 80
x -10 -5 0 5 10
y 80 5 -20 5 80
Answers
Answered by
Damon
SKETCH A GRAPH !! Always
note
symmetric about x = 0
note
hits bottom at (0,-20) (so that is the vertex)
so
(y +20) = a x^2
at (10,80)
100 = a(100)
a = 1
so I claim
x^2 = y + 20
note
symmetric about x = 0
note
hits bottom at (0,-20) (so that is the vertex)
so
(y +20) = a x^2
at (10,80)
100 = a(100)
a = 1
so I claim
x^2 = y + 20
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