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

Algebra ->  Rational-functions -> 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      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
# 1 Correct

# 2 Correct

# 3 b%5E19%2Ab%5E0=b%5E%2819%2B0%29=b%5E19. Simply add the exponents.

# 4 Correct if the expression is root%287%2C19%29

# 5 If your answer is a%5E3%2Bt%5E3, then you are correct.

# 6 If the problem is %28sqrt%28u%29-sqrt%28v%29%29%2F%28sqrt%28u%29%2Bsqrt%28v%29%29, then the answer is %28u%2Bv-2%2Asqrt%28u%2Av%29%29%2F%28u-v%29 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.