Algebra maximum number of turning points in a graph?

Question

What is the maximum number of turning points in the graph of P(x) = 2x² + 14x - 7? 

a) 1

b) 2

c) 3

d) 4

Answer 1

it's a parabola (degree n = 2). in general, polynomial of degree n has n-1 turns (maximum). so this has 1 turn, of course.