Find the Average Rate of Change of the Function from X₁

Multiple Choice

Find the average rate of change of the function from x₁ = 1 to x₂ = 6. $f ( x ) = - x ^ { 3 } + 2 x ^ { 2 } + x$

A) The average rate of change from x₁ = 1 to x₂ = 6 is 19.
B) The average rate of change from x₁ = 1 to x₂ = 6 is -9.
C) The average rate of change from x₁ = 1 to x₂ = 6 is 9.
D) The average rate of change from x₁ = 1 to x₂ = 6 is -28.
E) The average rate of change from x₁ = 1 to x₂ = 6 is -2.