Question

polynomial (-1)and polynomial (2) for 2x(cube) - 3x +5

Answer 1

Answer:

For p(-1)

p(-1)= 2(-1)^3 -3(-1) +5

p(-1)= -2+3+5

p(-1) = 6

For p(2)

p(2)= 2(2)^3-3(2)+5

p(2)= 16-6+5

p(2)= 15

Step-by-step explanation:

put the value of x as -1 and 2 because we havw to fimd the value of p(-1) and p(2)

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Answer 2

Answer:

p(-1) = 6

p(2) = 15

Note:

If the expression of any polynomial p(x) is given the to find the the value of polynomial p(x) at x = a ( ie ; to find p(a) ) , we just need to put x = a everywhere in the expression of p(x) .

Solution:

Here,

The given polynomial is ;

p(x) = 2x³ - 3x + 5 .

We need to find p(-1) and p(2) .

Thus,

=> p(x) = 2x³ - 3x + 5

=> p(-1) = 2(-1)³- 3(-1) + 5

=> p(-1) = -2 + 3 + 5

=> p(-1) = 6

Also,

=> p(x) = 2x³ - 3x + 5

=> p(2) = 2(2)³ - 3(2) + 5

=> p(2) = 16 - 6 + 5

=> p(2) = 15

Hence,

p(-1) = 6

p(2) = 15