Question

for a polynomial p(x) 2x cube+6x square -2x+ 9 find the value of p(-1)

Answer 1

Answer:

p ( -1 ) = 2.-1^3 + 6.-1^2 - 2.-1 + 9

= 2.-1 + 6.1 + 2 + 9

=. -2 + 6 + 11

= 4 + 11

= 15

hope it helps

Answer 2

Answer:

Solution of this question  

Let p(x) =3x3 – 4x2 + 7x – 5

At x= 3, p(3) = 3(3)3 – 4(3)2 + 7(3) – 5

= 3×27-4×9 + 21-5 = 81-36+21-5 P( 3) =61

At x = -3, p(-3)= 3(-3)3 – 4(-3)2 + 7(-3)- 5

= 3(-27)-4×9-21-5 = -81-36-21-5 = -143 p(-3) = -143

Hence, the value of the given polynomial at x = 3 and x = -3 are 61 and -143, respectively.