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.

What is Polygon? a plane figure with at least three straight sides and angles, and typically five or more . Example of Polygons: Triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon according as it contains 3,4,5,6,7,8,9,10 sides respectively.

Area of Polygon CBSE Class VIII Maths The plots and fields are in the form of regular or irregular polygons. We find their areas by dividing them into triangles, rectangles, parallelograms and trapeziums. 1. In the give figure, PQRS is a quadrilateral in which PR=32m, QX perpendicular PR,   SY perpendicular PR such that QX=10m and SY=8m. Find the area of the quad PQRS. Answer:

Area of a Trapezium, CBSE NCERT (Class 8, 9,10) Trapezium : A trapezium is a quadrilateral having one pair of parallel opposite sides.