Question

Equation in replies...Will give medal
Which represents the sum of series:
144

153

270

90

Answer 1

Where is the equation?

Answer 2

From j = 1 to 4, find the sum of (3j)^2.

That is equal to:

3(1)^2 + 3(2)^2 + 3(3)^2 + 3(4)^2

Am I missing something after the exponent, because it looks cut off

Answer 3

No its just a questionmark after the exponent

Answer 4

I believe you can do the rest, right?

Answer 5

I sure hope so but if i need any more help i will let you know

Answer 6

What answer did you get

Answer 7

By the way, I did 3(3)^2 in laziness, it should be (3*3)^2, not 3*(3^2)

Answer 8

I don't agree.

This is (3 * 1)^2 + (3 * 2)^2 + (3 * 3)^2 + (3 * 3)^2

Answer 9

But it ends at j=4, so the final term would be ..+(3*4)^2

Answer 10

I got 270. Idk if thats correct but thats what i got

Answer 11

Yes, that is the answer

Answer 12

You're right about last term, @larryboxaplenty . I slipped.

Answer 13

270 is the result I got writing a short program.

Answer 14

There is also a shortcut, but it's more useful if the number of terms is above 10