Posted by **Joy** on Monday, January 19, 2009 at 8:28pm.

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: Radicals -
**Reiny**, Monday, January 19, 2009 at 8:41pm
just answered that in

http://www.jiskha.com/display.cgi?id=1232413142

- 8th Grade Algebra: Radicals -
**Damon**, Monday, January 19, 2009 at 8:41pm
1. (3+2sqrt 20 )(5+3sqrt 45) ???

use FOIL

15 + 9 sqrt(900) + 10 sqrt(900) + 900

but sqrt 900 = 30

so 15 + 19*30 + 900

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.

(x-5)(2x-6) = 2 x^2 -16 x + 30

b. What is the smallest integer value of x that will give positive values for the length and the width of the rectangle?

If x is <5, length is negative

if x < 3, width is negative

so 3

- Whoops, messed up first one, FOILed again -
**Damon**, Monday, January 19, 2009 at 8:44pm
I multiplied wrong, when I foiled.

## Answer This Question

## Related Questions

- 8th Grade Algebra - Find each product. { this means the square root sign. 1. (3+...
- coordinate algebra - The area of a rectangle is found by multiplying the length ...
- Algebra 8th grade - The length of a rectangle is twice its width. If the area is...
- Geometry Help - The length of a rectangle is 2 cm more that 5 times it's width. ...
- Calculus - A rectangle is bounded by the x axis and the semicircle = square root...
- Algebra - A rectangle has a width of 2(square root of 5)and an area of 50 cm^2. ...
- Algebra Homework, HELP! - 1) A rectangle has an area of 297 square inches and a...
- pre-algebra - Can you help me figure this? The area of a rectangle is 14 square ...
- 9th grade polynomials - How do you write the expression for the area of the ...
- algebra - The length of a rectangle is 3 more than twice the width. The area of ...

More Related Questions