Central Board Of Secondary Education – ( CBSE )
Class – 8
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Recommended Question & Answers for Class 8
1. Factorize – x2 + xy + 8x + 8y
Answer:
x2 + xy + 8x + 8y
Grouping the terms, we have
x2 + xy + 8x + 8y
= x(x + y) + 8(x + y)
= (x + y)(x + 8)
x2 + xy + 8x + 8y
Grouping the terms, we have
x2 + xy + 8x + 8y
= x(x + y) + 8(x + y)
= (x + y)(x + 8)
Hence, the required factors = (x + y)(x + 8)
2. A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?
Answer:
The force due to hammering causes the change in the shape of the iron and iron can be molded in the shape of the required tool.
The force due to hammering causes the change in the shape of the iron and iron can be molded in the shape of the required tool.
3. Explain why fossil fuels are exhaustible natural resources. ?
Answer:
Fossil fuels are exhaustible natural resources because they will be exhausted by human activities as they are limited in nature.
Fossil fuels are exhaustible natural resources because they will be exhausted by human activities as they are limited in nature.