CBSE | NCERT CLASS

(1) Which of the following expression is a polynomial of one variable? (i) x+5/x+5   (ii) 5 √ x+4x+7   (iii) √ 5x ² +x-5   (iv) x ⁴ +y ² +6

Polynomial : Let x be a variable (literal), n be a positive integer and a ˳ , a ₁ , a ₂ , a ₃ ......a n be constants (real numbers). Then a n xᶯ  + a n-1 . xᶯ⁻¹ + a n-2 . xᶯ⁻² + a₁x + a₀   is known as a polynomial in variable x. We use the notations like f(x), h(x), g(x) to denote polynomial in variable x.

Q1. All animals finally die, yet the species survives. Give reasons for this. Answer : All type of animals during his life span reproduce and produce young ones (offspring). Hence, even after they die, the species still exist on earth.

Q1. Why is it comfortable to lift a school bag with broad straps than thin straps? Answer: Pressure is inversely proportional to area. Since broader straps have greater area, so, the pressure decreases.