CBSE Maths Class 8 Exponents and Power

We will proceed to discuss the Exponents and Power from Class 8 Maths.

An Exponent stands for a way repeatedly the amount is increased.We have studied in previous Class‘how to put in writing massive numbers mistreatment exponents’. It involves 2 numbers a and b wherever a is base and b is that the exponent.

Mass of earth is 5,970,000,000,000,000,000,000,000 kg, which can be written as 5, 97 x 10 24 .

10 24 can be read as 10 raised to the power 24.

Now, we will find what is 2-2 is equal to?

Powers with negative exponents

We know that 10 2 = 10 x 10=100

As the exponents decrease by 1 the value becomes one tenth of the previous value.

10 1 =100/10=10

10 0 =10/10=1

10 -1 =1/10

10 2 =1/100

So, by observing the above pattern we can say that any integer a which is non -zero, a -m =1/ a m , where m is a positive integer.

a -m Is the multiplicative inverse of a m .

Laws of exponents

We know that for any non-zero integer a,a m x a n =a m+n
Example : -3 -4 x -3 -3 = 1/-3 4+3 = -3 -7

-7 is the sum of exponents -4 and -3

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