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March 3, 2015

March 3, 2015

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

{ 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 8:02pmThis 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 8:12pmI 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 10:36pmspce./ 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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