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Math Grade 9
Math Quarter 2
Division of Radicals
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Rationalizing the Denominator
Math Grade 9 > Math Quarter 2 > Division of Radicals
7 cards
Cards (37)
If there are
no common factors
between the
two terms
, then it
cannot
be
simplified
further.
To simplify an expression, we need to find the
largest perfect square
factor that can be factored out from
both
terms.
To divide by a
radical
expression, we need to find an
equivalent
fraction with the denominator as the
radicand.
We can use the same method if the
exponent
on the radicand is
not equal
to one.
The
numerator
is divided by the
radicand.
The
product
rule states that if x is a
real
number, then (x^a)(x^
b)
= x^(
a+b
).
The
quotient
rule states that if x is a nonzero real number, then (x^a)/(
x^b
) = x^(
a-b
), where b !=
0.
The
power
rule states that if n is any integer and p is any
rational
exponent, then (x^n)^p = x^(np).
When dividing by a rational number raised to a power, we raise the
numerator
and
denominator
to the same
power.
The
product
rule states that when
multiplying
radical expressions, we keep the same index but
add
the
exponents
inside the
radical
sign.
Simplifying
expressions involving division by a radical requires finding an equivalent fraction with the denominator as the
radicand.
When
dividing
by a rational number raised to a
power
, we raise the
reciprocal
of the
rational number
to the same
power.
The
quotient
rule states that when
dividing
radical expressions, we
subtract
the
exponents
inside the
radical
signs.
In some cases, we may have to multiply or divide by a
binomial
inside the
root
sign.
If n is any
positive
integer, then (
x^n)^m
=
x
^(
nm
)
The
power
rule states that if n is any integer and p is any
rational
number, then (x^n)^p = x^(np).
The
negative
exponent rule states that if x is a nonzero real number, then x^
-m
=
1/x^m.
If m and n are
integers
such that
m
> n,
then there
exist
unique integers q
and r such that
m = nq + r
, where
0
<= r < |n|.
If m is any
positive
integer, then
x^m/y^m = (x/y)^m
If the base is
negative
, we must consider whether the
exponent
is
even
or
odd.
If p and q are integers such that q > 0, then
x
^
p
/
x
^
q
=
x
^(
p-q
)
If the exponent is
odd
, the result will have the
opposite
sign as the
base.
If the exponent is even, the result will be
positive
regardless of the sign of the
base.
To divide two radical expressions with different indices, we first find
LCD
and
simplify
the expression.
We can use the definition of an irrational root to write one base as a
multiple
of another.
If the
bases
are
not equal
, we cannot perform
division
directly.
If the expression has
more than one
term, factor out the
common
factor first.
Divide both the numerator and denominator by the
highest perfect square factor.
If the expression under the square root symbol has no
perfect
squares, it cannot be expressed using only
whole
numbers.
A
decimal
can be written as a
fraction
or a
mixed number.
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