Homework Help: 8th Grade Algebra

Posted by Joy on Monday, January 19, 2009 at 7:59pm.

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 x-5 and 2x-6
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, Monday, January 19, 2009 at 8:02pm
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, Monday, January 19, 2009 at 8:12pm
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, Monday, January 19, 2009 at 8:39pm
(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
(x-5)(2x-6)
= .....

For the third part, look at x-5
isn't that positive for all values of x > 5 ???
what about the 2x-6 ??
8th Grade Algebra - giancarlo, Thursday, August 30, 2012 at 10:36pm
spce./ the diameter of mars is about 9.4 kilometers. write 9.4 as a product. then find the value of the product.

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