Question

UR
") If x= - 1 is a zero of the polynomial P
(x) = 8x³ - ax²– X + 2, find the value of
a.​

Answer 1

Answer:

a = - 5

Step-by-step explanation:

x = - 1

P ( x ) = 8x³ - ax² - x + 2

P ( - 1 ) = 8 ( - 1 )³ - a ( - 1 )² - ( - 1 ) + 2 = 0

              8 ( - 1 ) - a ( 1 ) + 1 + 2 = 0

              - 8 - a + 3 = 0

              - 8 + 3 - a = 0

              - 5 - a = 0

              - a = 5

                a = - 5