Question

if p(x) =2x+8-5x² then the value of p(-2) +p(1) is​

Answer 1

Answer:

p(-2) + p(1) = -9

Step-by-step explanation:

p(x) =2x+8-5x²

Now,

p(-2) = 2 × (-2) + 8 - 5 × (-2)² = - 4 + 8 - 20 = -16

=> p(-2) = - 16 ------------------------( i )

again,

p(1) = 2 × 1 + 8 - 5 × 1² = 2 + 8 - 5 = 5

=> p(1) = 5 ------------------( ii )

from eq (i)&(ii)

p(-2) + p(1) = - 16 + 5 = - 9

p(-2) + p(1) = -11

Answer provided by Gauthmath.

Answer 2

Answer:

-11 ans

Step-by-step explanation:

$p(x) = 2x + 8 - 5{x}^{2} \\ p( - 2) = 2( - 2) + 8 - 5 ({ - 2})^{2} \\ = - 4 + 8 - 5 (4) \\ = - 4 + 8 - 20 \\ = - 4 - 20 + 8 \\ = - 24 + 8 \: \: \: \: \: \: \: \: \: \: \\ p( - 2)= - 16 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ p(1) = 2(1) + 8 - 5({1})^{2} \\ = 2 + 8 - 5 \\ = 10 - 5 \\ p(1) = 5 \\ p( - 2) + p(1) = - 16 + 5 \\ = - 11 \: ans$