Question

Which of these is a quadratic polynomial? A) x^3-2x^2 B) 2x^2 C) 2x+1 D) x^4+2x​

Answer 1

(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.

Answer 2

ANSWER :-

• A quadratic polynomial contains a heighest power as 2.

Here in option (B)

$\sf{ \green{ \: 2 {x}^{2} }}$

• is the quadratic polynomial.