Respuesta :

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Answer:

a .

[tex] \frac{21 {a}^{3} }{3 {a}^{2} } = 7a[/tex]

b.

[tex](2x + y)(x - y) \\ = 2 {x}^{2} - 2xy + xy - {y}^{2} \\ = 2 {x}^{2} - xy - {y}^{2} \\ [/tex]

a.

[tex]3x + 2y - 2x + y \\ = x + 3y[/tex]

I hope I helped you^_^

Answer:

a = 7a, b = [tex]2x^2 - yx - y^2[/tex]

Step-by-step explanation:

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

b. [tex](2x + y)(x-y)[/tex]

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

[tex]2x^2 - 2xy + yx - y^2[/tex]

[tex]2x^2 - yx - y^2[/tex]

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