Question

Can someone please help me I don’t understand how to do it

9) Find the values of the following when x = 1, 2 and 3:
a. X 2 +2x-3
b. x 3 +5
C.X2 +5x+4

Answer 1

0 for x= 1
5 for x= 2
12 for x

Answer 2

Explanation:

x^2 + 2x - 3 = (1)^2 + 2(1) - 3 = 0 for x = 1

(2)^2 + 2(2) - 3 = 5 for x = 2

(3)^2 + 2(3) - 3 = 12 for x = 3

x^3 + 5 = (1)^3 + 5 = 6 for x = 1

(2)^3 + 5 = 13 for x = 2

(3)^3 + 5 = 32 for x = 3

x^2 + 5x + 4 = (1 )^2 + 5(1) + 4 = 10 for x = 1

(2)^2 + 5(2) + 4 = 18 for x = 2

(3)^3 + 5(3) + 4 = 46 for x = 3