Question

The value of a for which (x - 3) is a factor of polynomial x³ - 7x + a is



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Answer 1

Answer:

• given (x-3) so × = 3
• now subsitute x value in x³-7x +a
• then we get 3³-7(3)+a=0
• = 27 -21 +a = 0
• = 6 +a =0
• therefore a = -6

Answer 2

Step-by-step explanation:

Let g(x)=0

x-3=0

x=3

p(x)=(x)3-7(x)+a

p(3)=(3)3-7x(3)+a

27-21+a

6+a

a=-6