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8th Grade Algebra

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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 -

    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 -

    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 -

    (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 -

    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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