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Find the function rule.
1. x| -3| -2| -1| 0| 1| 2| 3
f(x)| 10| 5| 2| 1| 2| 5| 10
Let's compare f(x) to x²
1. x| -3| -2| -1| 0| 1| 2| 3
x²| 9| 4| 1| 0} 1| 4| 9
f(x)| 10| 5| 2| 1| 2| 5| 10
Each value of f(x) is 1 more than the square of x,
So f(x) = x²+1
2. x| -6| -4| -2| 0| 2| 4| 6
f(x)| 71| 31| 7|-1| 7| 31| 71
Let's also compare this one to x²
2. x| -6| -4| -2| 0| 2| 4| 6
x²| 36| 16| 4| 0} 4| 16| 36
f(x)| 71| 31| 7|-1| 7| 31| 71
That compares to 2x²
2. x| -6| -4| -2| 0| 2| 4| 6
x²| 36| 16| 4| 0} 4| 16| 36
2x²| 72| 32| 8| 0} 8| 32| 72
f(x)| 71| 31| 7|-1| 7| 31| 71
Each value of f(x) is 1 less than twice the square of x,
So f(x) = 2x²-1
Edwin