Complete the square for x and y.

7x^2 + 3y^2 - 28x - 12y = -19

7x^2 - 28x + 3y^2 - 12y = -19

7(x^2 - 4x) + 3(y^2 - 4y) = -19

7(x^2 - 4x + 4) + 3(y^2 - 4y + 4) = -19 + 28 + 12

7(x - 2)^2 + 3(y - 2)^2 = 21

$\dfrac{(x - 2)^2}{3} + \dfrac{(y - 2)^2}{7} = 1$

4 0

3 years ago

Which polygon will tessellate the plane?

Sedaia [141]

Answer:

Equilateral triangles, squares and regular hexagons are the only regular polygons that will tessellate. Therefore, there are only three regular tessellations.

Step-by-step explanation:

6 0

3 years ago

Who is first president of Czech republic?

Mariana [72]

The first President of the Czech Republic was Václav Havel

6 0

2 years ago

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