Class 7 Chapter 13 Maths Notes(NCERT) to make the chapter more easier. I hope it helps you.

1. 1) If a is a non-zero number and n is a natural number,
then the product of (a×a×a……….×a) is denoted by an
which is ‘a raised to power n’. a is a base and n is an
exponent or power. an
is also known as ‘the exponential
form of (a×a×a……….×a).
2) Laws of Exponents->
a. a0
=1
b. am
×an
=am+n
c. am
÷an
=am-n
d. am
×bm
=(ab)m
e. am
÷bm
=(a÷b)m
f. (am
)n
=am×n
g. a-m
=
1
aˆm
h. am/n
= √𝑎^𝑚
𝑛
i. -aeven number
= positive integer
j. -aodd number
= negative integer
n times
n times