Book Maths Puzzle Algebra

Write a rule for the quadratic function if
x- -1 0 1
f(x)- 6 5 6
thank you for your help

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Book Other Question

The sum of the digits of a 3-digit number is 9. If the digits are reversed, the numbers increases b 495. The sum of the tens and hunderds digits is one-half the ones digit. Find the number. Using y = Ax^2 + Bx + C

find the coordinates of the max/min point. you may want to put the form in
y=(x-h)^2+k

also, what determines if the point is a max or a min? (by the