Question

"Question 1 Find the value of the polynomial 5x - 4x^2 + 3 at (i) x = 0 (ii) x = −1 (iii) x = 2

Class 9 - Math - Polynomials Page 34"

Answer 1

The value of a polynomial obtained on putting a particular value of the variable is called the value of the polynomial.

 

The value of a polynomial p(x) at x= a(let) is denoted by p(a).

 

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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

 

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Answer 2

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