Question

Which of the following will be the value of p(-1) for the given polynomial P(x) = x³ + 5x² + 26​

Answer 1

Answer:

since 2 roots are of different sign and same magnitude

let roots are±α,β

α−α+β=5

β=5

−α

2

β=80

±α=

16

α=±4

roots are 4,−4 and 5

Answer 2

Answer:

30

Step-by-step explanation:

p(-1) = (-1)³ + 5(-1)² + 26

-1+5+26

= 30