Question

If P (x) =3x^3 - 4x^2+ 7x-5
find P(3)+ P(-3)​

Answer 1

Answer:

-82

Step-by-step explanation:

Given,

P (x) = 3x³ - 4x²+ 7x-5

so, P(3) = 3(3)³ - 4(3)²+ 7(3)-5

            = 3(27) - 4(9)+ 21-5

            = 81 - 36 + 16

            = 81 - 20

    P(3) = 61

similarly, P(-3) = 3(-3)³ - 4(-3)²+ 7(-3)-5

            = 3(-27) - 4(9) - 21-5

            = -81 - 36 - 26

            = -81 - 62

    P(-3) = -143

=>P(3) + P(-3) = 61 + (-143)

                      = -82