Question

the function f(x)=-5x^{2}+17x + 21 models the predicted sales of a pen after x price increases. use the table

x	actual sales ($)	predicted sales ($)	residual
1	33	33
2	36	35
3	26	27

Explanation:

Step1: Recall residual formula

Residual = Actual - Predicted

Step2: Calculate residual for x = 0

Residual = 22 - 21 = 1

Step3: Calculate residual for x = 1

Residual = 33 - 33 = 0

Step4: Calculate residual for x = 2

Residual = 36 - 35 = 1

Step5: Calculate residual for x = 3

Residual = 26 - 27 = - 1

Answer:

1
0
1
-1