Find the value of (12m – 15n)2
122m2 – 360mn + 225n2
144m2 + 360mn + 125n2
144m2 – 360mn + 225n2
144m2 – 180mn + 225n2
By using square identity (a - b)2 = a2 + b2- 2ab, we get
(12m – 15n )2 = 144m2 – 360mn + 225n2
The area of four walls of a room of height 5 m is 144 m2. If the total surface area of the room is 244 m2 then its length is
The length of a rectangular plot is 12m and its perimeter is 60m. Find its width.