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3^(6) X 3^(-4) =

Providing the coefficient, '3' in this case, is the same for both number. then you add the indices. Hence

3^(6) X 3^(-4) =

3^(6 + -4) =

3^(2) = 9

Another way

3^(6) X 3^(-4) = 3^(6) X 1/ 3^(4) = 3^(6) / 3^(4) = 3^(6-4) = 3^(2)

Note when placed under '1' the negative is dropped.

A third way

(3 x 3 x 3 x 3 x 3 x 3) / (3 x 3 x 3 x 3)

Cancel down '3' by '3' , or '3' for '3' hence

3^(2)

General rules for manipulating indices.

#1 ; The coefficients MUST be the same . For different coefficients , you CANNOT do these manipulations.

#2 ; a^(m) X a^(n) = a^(m+n)

#3 ; a^(m) / a^(n) = a^(m-n)

#4 ; (a^(m))^(n) = a^(mn)

a^(m) X b^(n) cannot be done!!!!! , because 'a' & 'b' are different coefficients.

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lenpollock

Lvl 16
1y ago

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