Posted by Joy on .
Find each product.
{ this means the square root sign.
1. (3+2{20)(5+3{45)
2. The length and width of the rectangle are x5 and 2x6
a. Write a trinomial that represents that area of the rectangle.
b. What is the smallest integer value of x that will give positive values for the length and the width of the rectangle?

8th Grade Algebra 
Mike,
This would really be
(5SQRT20)(8SQRT45)
ROunded
(22.4) (53.7)
IM not sure if you have to mulitply these, but if you do.....this would be youe answers
1202.88
Hope this helps. 
8th Grade Algebra 
Joy,
I am talking about Radicals, not actaully calculating the square roots.
My book says that the answer is
195 + 47*{5
I just don't get how they got that answer. 
8th Grade Algebra 
Reiny,
(3+2√20)(5+3√45)
multiply it using FOIL
= 15 + 9√45 + 10√20 + 6√900
= 15 + 27√5 + 20√5 + 180
= 195 + 47√5
for the second, just multiply the two expression, and again use FOIL
(x5)(2x6)
= .....
For the third part, look at x5
isn't that positive for all values of x > 5 ???
what about the 2x6 ?? 
8th Grade Algebra 
giancarlo,
spce./ the diameter of mars is about 9.4 kilometers. write 9.4 as a product. then find the value of the product.