Sum of squares calculation

MathematicsSeries and SummationsMedium

Published:

$1^2 - 2^2 - 3^2 - \dots - 10^2 =$

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Step by Step Written Solution

1
Step 1

Halo Damar, mari kita selesaikan soal matematika ini bersama-sama.

Menyelesaikan Deret Kuadrat

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Step 2

Perhatikan bahwa ekspresi ini adalah satu kuadrat dikurangi jumlah dari dua kuadrat hingga sepuluh kuadrat.

$$1^2 - (2^2 + 3^2 + 4^2 + 5^2 + 6^2 + 7^2 + 8^2 + 9^2 + 10^2)$$
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Step 3

Strategi kita adalah menggunakan rumus jumlah kuadrat, yaitu n dikali n tambah satu dikali dua n tambah satu, dibagi enam.

Rumus Jumlah Kuadrat

$$S_n = \frac{n(n+1)(2n+1)}{6}$$
4
Step 4

Mari kita hitung jumlah kuadrat dari satu sampai sepuluh.

$$S_{10} = \frac{10(10+1)(2(10)+1)}{6}$$
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Step 5

Sepuluh dikali sebelas dikali dua puluh satu, dibagi enam.

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Step 6

Hasil dari perhitungan tersebut adalah tiga ratus delapan puluh lima.

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About This Question

Subject
Mathematics
Topic
Series and Summations
Difficulty
Medium
Question Type
Open Ended

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