Aprenda a encontrar formulas recursivas para progressoes aritmeticas. Thats Herons Formula right there. So for n4 first use the equation f n 12 - 7 n - 1 plug in 4 for n.
A Khan Academy e uma organizacao sem fins lucrativos.
And here theyve told us the arithmetic sequence a-sub-i is defined by the formula a-sub-1 they gave us the first term and they say every other term so a-sub-i. Aprenda a encontrar formulas recursivas para progressoes aritmeticas. Explicit formulas for arithmetic sequencesWatch the next lesson. The first term of the sequence.