if p(x) = 2x³-x²+3x+1, then find the value of p(-1) + p(2)
{the answer is 14,,, but i want to know how?}
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Answered by
11
Answer:
here
let x = -1
put the value of x in equation
like ,,,,,
p(-1) = 2(-1)^3 - (-1)^2 + 3(-1) + 1
p(-1) = -2 -1 -3 +1
p(-1) = -5[ equation 1 ]
similarly ,,,,
let x= 2
then,,,,
p(2) = 2(2)^3 - (2)^2 + 3(2) +1
p(2) = 16 - 4 +6 + 1
p(2) = 19 [ equation 2 ]
from equation 1 and 2
p(-1) + p(2) = -5 + 19
= 14
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