SOLUTION: Could you recheck theses over. I am doing a test and unsure. 1. Multiply (-3z)^2(2z^2)^3 answer 72z^8 2. Simplify by factoring assume that all expressions under radical represe

Question 198305: Could you recheck theses over. I am doing a test and unsure.
1. Multiply
(-3z)^2(2z^2)^3
answer 72z^8
2. Simplify by factoring assume that all expressions under radical represent nonegative numbers
sqrt45a^2b
Answer 3asqrt5b
3, multiply and simplify assume variable represent nonzero real numbers
b^19 b^0
Answer No solution
4.Rewrite with a rational exponent
root7:sqrt19
answer 19^(1/7)
5. multiply
(a+t)(a^2-at+t^2)
answer a^3=t^3
6. Rationalize the denominator, assume that all expressions under radicals represent positive numbers
sqrt u-sqrt v/sqrt u+sqrt v
u+v-2sqrt(uv)/(u-v)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
# 1 Correct

# 2 Correct

# 3 . Simply add the exponents.

# 4 Correct if the expression is

# 5 If your answer is , then you are correct.

# 6 If the problem is , then the answer is which is what I'm assuming you have (it's hard to read). If that's what you have, then you have the right answer.

Good job, you only missed one problem.

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