Question

6.
l'x 3' x 5 =
(A) 135
(B) (135)333
(C) 3
(D) (1 x 3 x 5)​

Answer 1

Step-by-step explanation:

1.  Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

Ans. (i)   4x2 – 3x + 7

                ⇒ 4x2 – 3x + 7x°

                ∵ All the exponents of x are whole numbers.

                ∴ 4x2 – 3x + 7 is a polynomial in one variable.

         (ii)   

                 

                ∵ All the exponents of y are whole numbers.

                ∴  is a polynomial in one variable.

         

         

         (v)   x10 + y3 + t50

                ∵; Exponent of every variable is a whole number,

                ∴ x10 + y3 + t50 is a polynomial in x, y and t, i.e. in three variables.

2.  Write the co-efficients of x2 in each of the following:

         (i)   2 + x2 + x

         (ii)   2 – x2 + x3

         (iii)   

         (v)   

Ans. (i)   2 + x2 + x

                The co-efficient of x2 is 1.

         (ii)   2 – x2 + x3

                The co-efficient of x2 is (–1).

         (iii)   

                The co-efficient of x2 is 

         (iv)