Question

Pls, help.
No spams, please.
Best answer will be marked as brainliest.

Answer 1

Answer:

       a= -9

       b= 24

Step-by-step explanation:

p(x)=x^3+ax+bx-20

x-5=0

x=5

p(5)=>5^3+25a+5b-20=0

     =>125+5(5a+b)-20=0

     =>5(5a+b)= -105

     =>5a+b= -21.......(equation i)

x-3=0

x=3

p(3)=>3^3+9a+3b-20= -2

    =>27+3(3a+b)-20= -2

   =>3(3a+b)= -9

   =>3a+b= -3........(equation ii)

subtracting equation ii from i

5a+b= -21

3a+b= -3

------------------

2a = -18

a= -9

putting the value of a in equation i

5(-9)+b= -21

-45+b= - 21

b= -21+45

b= 24

ans. a= -9

       b= 24