(6a)^8*(6a)^7

I get 36a^15 but I feel this is wrong

You're right about being wrong

6a^8 * 6a^7 = 36a^15
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But you have (6a)^8 = 6^8* a^8
(6a)^7 = 6^7 * a^7

So the product is 6^15 * a^15

so my answer is 6a^15

To simplify the expression (6a)^8 * (6a)^7, you can use the property of exponents which states that when you multiply powers with the same base, you add their exponents. Here's how you can do it step by step:

Step 1: Recognize that both terms have the same base, which is 6a.
Step 2: Apply the exponent rule: Add the exponents together.
(6a)^8 * (6a)^7 = (6a)^(8+7)
Step 3: Add the exponents: 8 + 7 = 15.
(6a)^(8+7) = (6a)^15
Step 4: Rewrite the expression with the simplified exponent.
(6a)^8 * (6a)^7 = 36a^15

Therefore, your initial solution is correct! The simplified expression is 36a^15. Well done!