Question

if the length of a cardboard is (2x+4) into metres and the breadth is (x-5) metres, find the area of the card.​

Answer 1

Answer:

2x²- 6x - 20 meters

Step-by-step explanation:

If u r in 8th class

So, do u remember that identity

(a+b) (a-b) = a²- b²

using this identity

area of cardboard ( assuming the cardboard as a rectangle ). = (2x +4) × (x-5)

(2x+4)²- (x-5)² = (2x +4) × (x-5)

(4x²+ 16) - (x²- 5) = (2x +4) × (x-5)

3x² - 41 = (2x +4) × (x-5)

Hence, the area is 3x² - 41