Expand the following, using suitable identities: (3a – 7b – c)2
Answer: Given (3a – 7b – c)2 Using identity (x + y + z)2 = x2 + y2 + z2... View Article
Latest Posts
Expand the following, using suitable identities: (x + 2y + 4z)2
Answer: Given (x + 2y + 4z)2 Using identity, (x + y + z)2 = x2 + y2 + z2... View Article
Expand the following, using suitable identities: [(1/4)a – (1/2) b + 1)2
Answer: Given [(1/4)a – (1/2)b + 1]2 Using identity (x + y + z)2 = x2 + y2 + z2... View Article
Explain how animals dwelling in the forest help it grow and regenerate.
Answer: Forests are habitat to a variety of species, including herbivores, carnivores, microorganisms, and others. They contribute to the growth... View Article
Explain how does lightning conductor protect a building from getting struck by lightning.
Answer: The lightning conductor is a thick copper wire or a strip that is secured onto the tallest point of... View Article
Explain how forests prevent floods.
Answer: Forest is a dense land or a complex ecosystem consisting of rich biodiversity and supports a variety of life... View Article
Explain how lightning takes place?
Answer: Because the speed of light is greater than the speed of sound, lightning arrives before thunder. As a result,... View Article
Explain how painting of an iron gate prevents it from rusting
Answer: Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron... View Article
Explain the difference between thermoplastic and thermosetting plastics.
Answer: Plastic is defined as a material that contains as an essential ingredient an organic substance of large molecular weight.... View Article
Explain the function of bar screens in a wastewater treatment plant.
Answer: The black–brown water that drains from sinks, showers, toilets, and laundries is unclean because it is rich in lather... View Article
Explain the process which enables us to perceive motion in a cartoon film.
Answer: We notice the display of static pictures on the screen in a specific order in a cartoon film. In... View Article
Explain the relationship between sanitation and disease.
Answer: Sanitation and disease are interrelated as lack of sanitation leads to illness and good sanitation practices prevent the diseases.... View Article
Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Answer: Forests are referred to as the lungs of the Earth. These absorb carbon dioxide from the atmosphere and release... View Article
Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon.
Answer: A charged balloon repels another charged balloon in the first scenario because both contain like charges, which repel each... View Article
Explain why a charged body loses its charge if we touch it with our hand.
Answer: The human body is an electrical conductor. As a result, when we come into contact with a charged object,... View Article
Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Answer: Physical change – A substance is said to undergo a physical change when only the physical properties such as... View Article
Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.
Answer: Lightning can be explained in terms of charges produced due to rubbing. During a thunderstorm, the air currents move... View Article
Explain why rusting of iron objects is faster in coastal areas than in deserts.
Answer: Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron... View Article
Explain why the following are made of thermosetting plastics. (a) Saucepan handles (b) Electric plugs/switches/plug boards
Answer: Thermosetting plastics are made up of long chains of molecules that are cross-linked. They have a very rigid structure.... View Article
Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?
Answer: After a long period of usage, the mortar and pestle lose their roughness, causing the frictional force to decrease... View Article
