Question

find the value of a and b if x+ 2 is a
factor of f(x) = ax²-x²-20x+ b and f(4)=84

plz answer plzz​

Answer 1

Answer:

Hi there !!!

Given,

x - a is a factor of

we know,

x - a = 0

x = 0+a = a

Substitung the value of x as a,

we have,

(a)^3 - a(a)^2 + 2(a) + a - 1 =0

a^3 - a^3 + 2a + a - 1=0

3a - 1=0

3a =1

a = 1/3

Thus

a = 1/3

Step-by-step explanation:

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