Question

EXERCISE 2.2
1. Find the value of the polynomial 5x - 4x +3 at
(1) r=0
(ii) r=-1
(i) x=2
only 2 nd number​

Answer 1

Solution:

i)                

 

p(x) = 5x - 4x² + 3

 

On putting x=0 ,

p(0) = 5(0) - 4(0)² + 3

= 0 - 0 +3=3

= 3

 

ii)

(x) = 5x - 4x² + 3

On putting x= -1,

 

p(-1) = 5(-1) - 4(-1)²+ 3

= -5 - 4(1) + 3

= -5-4+3= -9+3= -6

= -6

 

 

iii)

p(x) = 5x - 4x² + 3

 

On putting x=2

p(2) = 5(2) - 4(2)² + 3

= 10 – 16 + 3 = -6+3

= -3

Answer 2

Answer:

5 x - 4 x ^2 + 3 = 0

putting x = 0

5 (0 ).- 4 ( 0) ^2 + 3 = 0

0 - 0 + 3 = 0

not possible

2 ) 5 ( - 1) - 4 (-1) ^2 + 3 = 0.

'5 - 4 + 3 = 0

1 + 3 = 0

4 =0

not possible

3) 5 (2) - 4 (2)^2 + 3 = 0

10 - 16 + 3 = 0

-3 = 0

not possible

none of them r possible for this equation