Question

A. Divide: 21a3 by 3a? ? 2 b. Multiply: (2x+y) by (x-y) 3. a. Simplify: 3x+2y-2x+y

hellp mee plzz ​

Answer 1

a = 7a, b =
`2x^2 - yx - y^2`

Explanation:

a. 21 / 3 = 7.
`a^3 / a^2 = a` (exponents are basically subtracted when dividing), creating 7a

b.
`(2x + y)(x-y)`

Use FOIL for this or use the distributive property, either way. Then combine like terms

`2x^2 - 2xy + yx - y^2`

`2x^2 - yx - y^2`

Answer 2

a .

`\frac{21 {a}^(3) }{3 {a}^(2) } = 7a`

b.

`(2x + y)(x - y) \\ = 2 {x}^(2) - 2xy + xy - {y}^(2) \\ = 2 {x}^(2) - xy - {y}^(2) \\`

a.

`3x + 2y - 2x + y \\ = x + 3y`

I hope I helped you^_^