Question

question is from RD Sharma's guide .pls explain the answer .pls help me correct answers will be marked as brainiest☆.☆​

Answer 1

Answer:

Correct option is

a=2

b=0

Step-by-step explanation:

If f(2)=2(2)

3

−5(2)

2

+a(2)+b=0

⇒16−20+2a+b=0⇒2a+b=4

⇒f(0)=2(0)

3

−5(0)

2

+a(0)+b=0

⇒b=0⇒2a=4⇒a=2,b=0

Answer 2

Answer:

firstly we will put the value of x=2

2*2³-5*2²+a*2=0

2*8-5*4+2a=0

16-20+2a=0

4+2a=0

2a=-4

a=-4/2

a=-2

for finding b

2*2³-5*2²+b=0

2*8-5*4+b=0

16-20+b=0

4+b=0

b=-4