1^2 + 4^2 + 7^2 -... - (3n - 2)^2 = n(6n^2 - 3n - 1)/2

1

2

+

4

2

+

7

2

−

.

.

.

−

(

3

−

2

)

2

=

(

6

2

−

3

−

1

)

/

2

Step-by-step explanation:

answer: get more recipes with 3 magazines for $20! i often use chicken broth instead of water. 3 tablespoons butter, divided; 1/2 cup freshly grated parmigiano-reggiano bring water and salt to a boil in a large saucepan; pour polenta slowly into 5 minutes to thicken; stir and taste for salt before transferring to a serving bowl.

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step-by-step explanation:

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