Question

f(x)=5xsquare+ax+b(x= -2,x= -1/5) Find a,b

Answer 1

Answer:

F(x)= 5x²+ax+b

given that x = -2, -1/5

put x= -2

20 -2a+ b = 0

2a-b = 20.............(1)

put the x = -1/5

1/5-a/5+b = 0

1-a +5b =0

a -5b = 1...........(2)

solve equation (1) and (2)

2a- b = 20

2a- 10b = 2

9b = 18

b= 2

b value put the equation 1

2a- b = 20

2a = 22

a= 11

this is your answer ✔️✔️

Answer 2

Answer:

F(x)= 5x²+ax+b

given that x = -2, -1/5

put x= -2

20 -2a+ b = 0

2a-b = 20.............(1)

put the x = -1/5

1/5-a/5+b = 0

1-a +5b =0

a -5b = 1...........(2)

solve equation (1) and (2)

2a- b = 20

2a- 10b = 2

9b = 18

b= 2

b value put the equation 1

2a- b = 20

2a = 22

a= 11