Hi math whizzes,

Could you help me out with this homework problem and concept?

PhoenixForever
Nov 7, 2018

#1**+2 **

It crosses the x axis at x = - 1

The...it crosses the x axis again at x = 1

And f(-2) = f(2)

So.....this appears to be a quadratic [ a parabola that turns upward ] = degree 2

CPhill
Nov 7, 2018

#3**+1 **

boo CPhill, enough of these have been done that I'd have thought you'd seen one by now.

You need to take successive adjacent differences of f(x)

\(\left( \begin{array}{c} \{30,0,-2,0,30,160,510\} \\ \{30,2,-2,-30,-130,-350\} \\ \{28,4,28,100,220\} \\ \{24,-24,-72,-120\} \\ \{48,48,48\} \\ \end{array} \right)\)

in the matrix above the first line is f.

successive lines are formed by taking the line above minus it shifted 1 place to the left

that we could do this 4 times before all the numbers were equal shows that f is degree 4

Rom
Nov 7, 2018