Question

Please. I really need help in Algebra I. THE PICTURE GOES TO THE THIRD PROBLEM.

1) What is the product? 2x(x-4)

2x^2-4

2x^2-8

2x^2-4x

2x^2-8x


2) What is the product? -9X(5-2x)

18x^2-45x

-18x^2-45x

-18x-45x

18x-45x


3) Adi used algebra tiles to represent the product .



Which is true regarding Adi’s use of algebra tiles? (-2x-2)(2x-1)


She used the algebra tiles correctly.

She did not represent the two original factors correctly on the headers.

The signs on some of the products are incorrect.

Some of the products do not show the correct powers of x.

Answer 1

She used the algebra tiles correctly.

Explanation:

This is the answer on edgenuty

Answer 2

1) 2x^2 -8x

2) 18x^2 -45x

Explanation:

These problems make use of the distributive property. It tells you how you can use or eliminate parentheses as you may need.

a(b + c) = ab + ac . . . . . . . the outside factor multiplies each inside term

Of course, the usual rules of multiplication of positive and negative numbers apply. If the number of minus signs in a product is odd, the result is negative; otherwise the result is positive.

1. 2x(x -4) = (2x)(x) + (2x)(-4) = 2x^2 -8x

2. -9x(5 -2x) = (-9x)(5) + (-9x)(-2x) = -45x +18x^2 = 18x^2 -45x

3. She used the algebra tiles correctly.

• The headers correctly represent -2x-2 and 2x-1
• Each product has the correct sign (-- = +, -+ or +- = -)
• Each product has the correct power of x