## anonymous 3 years ago a9 × a18 =

1. jtvatsim

you mean $a^9\times a^{18}$ right?

2. jtvatsim

Remember that exponents just mean to multiply a number by itself that many times. So you have 9 a's multiplying together and then 18 a's multiplying together. How many a's have you multiplied?

3. anonymous

add the powers a^m x a^n gives a^m+n

4. whpalmer4

$a^n*a^m=a^{n+m}$

5. whpalmer4

for example, $a^3*a^4 = (a*a*a)*(a*a*a*a) = a*a*a*a*a*a*a = a^7 = a^{3+4}$

6. anonymous

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